This guide will teach you how to use various tools for externally reprogramming a 25xx NOR flash via SPI protocol. This is the most common type of flash IC for computers that coreboot runs on. Almost every system currently supported by Libreboot uses this type of boot flash; the only exception is ASUS KFSN4-DRE, which uses LPC flash in a PLCC32 socket, which you can simply hot-swap after booting the vendor firmware, and then flash internally. Simple!
We will be using the flashrom software which is written to dump, erase and rewrite these flash chips.
Libreboot currently documents how to use these SPI programmers:
Many other SPI programmers exist. More of them will be documented on this page, at a date in the future.
Most systems in Libreboot have to be re-flashed externally, using instructions on this and similar guides, the first time you flash. However, on all currently supported systems, it’s possible that you can re-flash internally when Libreboot is running.
Internal flashing means that the host CPU on your system can re-program the SPI flash, using an on-board SPI programmer (which all boards have). You do this from GNU+Linux, with flashrom.
This guide that you’re reading now is for using an external programmer. It is called external because it’s not the internal one on your mainboard.
NOR flashes on Libreboot systems run on 3.3V DC, and this includes data lines. CH341A has 5V logic levels on data lines, which will damage your SPI flash and also the southbridge that it’s connected to, plus anything else that it’s connected to.
These ch341a programmers are unfortunately very popular. DO NOT use it unless you have fixed the issue. You CAN fix it so that the data lines are 3.3v, if you follow the notes here:
In practise, most people will not fix their ch341a and instead just risk it, so no documentation will be provided for ch341a on this website. It is best to discourage use of that device.
Not covered on that eevblog page: the WP/HOLD pins (pins 3 and 7) must be held high via pull-up resistors, but on CH341A dongles, they are directly connected to 3.3V DC (continuity with pin 8). It is advisable to cut these two connections, to the WP and HOLD pins, and jump the cuts using pull-up resistors instead. A value between 1k to 10k (ohms) should be fine.
In case it’s not clear:
Please do not buy the ch341a! It is incorrectly engineered for the purpose of ROM flashing on systems with 3.3v SPI (which is most coreboot systems). DO NOT USE IT! This issue still isn’t fixed by the manufacturer, and it doesn’t look like they will ever fix it.
If you see someone talking about CH341A, please direct them to this page and tell them why the CH341A is bad.
In all of them, a dot or marking shows pin 1 (in the case of WSON8, pad 1).
Use the following photos and then look at your board. When you’ve figured out what type of chip you have, use that knowledge and the rest of this guide, to accomplish your goal, which is to read from and/or write to the boot flash.
SOIC8 and SOIC16 are the most common types, but there are others:
It will be like this on an X200S or X200 Tablet:
On T400S, it is in this location near the RAM:
NOTE: in this photo, the chip has been replaced with SOIC8
SSH into your BeagleBone Black. It is assumed that you are running Debian 9 on your BBB. You will run
flashrom from your BBB.
NOTE: This section is out of date, because it is written for Debian 9 (running on the BBB)
Run the following commands as root to enable spidev:
config-pin P9.17 spi_cs config-pin P9.18 spi config-pin P9.21 spi config-pin P9.22 spi_sclk
Verify that the spidev devices now exist:
/dev/spidev1.0 /dev/spidev1.1 /dev/spidev2.0 /dev/spidev2.1
Now the BBB is ready to be used for flashing. The following systemd service file can optionally be enabled to make this persistent across reboots.
[Unit] Description=Enable SPI function on pins [Service] Type=oneshot ExecStart=config-pin P9.17 spi_cs ExecStart=config-pin P9.18 spi ExecStart=config-pin P9.21 spi ExecStart=config-pin P9.22 spi_sclk RemainAfterExit=yes [Install] WantedBy=multi-user.target
Now test flashrom:
./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512
It is important to use
spispeed=512 or a lower number such as 256 or 128, because otherwise the BBB will be quite unstable.
Calibrating delay loop... OK. No EEPROM/flash device found. Note: flashrom can never write if the flash chip isn't found automatically.
This means that it’s working (the clip isn’t connected to any flash chip, so the error is fine).
BeagleBone Black is not recommended, because it’s very slow and unstable for SPI flashing, and nowadays much better options exist. We used to mainly recommend the BBB, because of the fact that it can be used with entirely Free Software on it, but nowadays there are superior options.
TODO: document other SPI flashers
SSH into your Raspberry Pi. You will run
flashrom from your Raspberry Pi.
You must configure
spidev on your Raspberry Pi. This is a special driver in the Linux kernel; technically, the driver name is
This page has info:
In your Raspberry Pi, which we assume you’re running the latest Raspbian version on, do this:
Under the Interface section, you can enable SPI.
The device for communicating via SPI as at
Basically, the Raspbian project, now called Raspberry Pi OS, put in their repo an update that added a new “trusted” repository, which just so happened to be a Microsoft software repository. They seem to have done this for VS Code, but the problem here is that it gave Microsoft free reign to define whatever dependencies they liked (as per apt-get rules), and every time you updated, you would be pinging Microsoft servers. Do you think that is strange?
Microsoft shouldn’t have any access to your GNU+Linux system! This was the commit that Raspbian added to their distro, which added this what should rightly be called a security vulnerability, intentionally:
They then removed it, after a public backlash, via the following commits:
For now, Raspbian / Raspberry Pi OS (which is based on Debian) should be safe, but this whole episode proves that the distro can no longer be trusted to respect its users. Therefore, it’s now on the tasks page a TODO entry for recommending and documenting alternative GNU+Linux distros on the Raspberry Pi, for the purposes of SPI flashing.
If you’re using a BBB or RPi, you will do this while SSH’d into those.
Flashrom is the software that you will use, for dumping, erasing and rewriting the contents of your NOR flash.
In the Libreboot build system, from the Git repository, you can download and install flashrom. Do this after downloading the lbmk Git repository:
cd lbmk sudo ./build dependencies ubuntu2004
NOTE: debian, arch or void can be written instead of ubuntu2004. the debian script is also applicable to newer ubuntu versions
./download flashrom ./build module flashrom
ubuntu2004 script complains about missing dependencies, just modify the script and remove those dependencies. The script is located at
resources/scripts/build/dependencies/ubuntu2004 and it is written for Ubuntu 20.04, but it should work fine in other GNU+Linux distributions that use the
apt-get package manager.
flashrom/ directory will be present, with a
flashrom executable inside of it. If you got an error about missing package when running the dependencies command above, tweak
resources/scripts/build/dependencies/ubuntu2004. That script downloads and installs build dependencies in apt-get and it is intended for use on x86-64 systems running Ubuntu 20.04, but it should work in Raspbian on the Raspberry Pi.
Alternatively, you may download flashrom directly from upstream at https://flashrom.org/Flashrom
If you’re flashing a Macronix flashchip on a ThinkPad X200, you will want to use a special patched version of flashrom, which you can download here: https://vimuser.org/hackrom.tar.xz - patched source code is available, and a binary is also available that you can simply run. Pass the
--workaround-mx argument in flashrom. This mitigates stability issues.
If you downloaded the flashrom source code directly, you can go into the directory and simply type
make. In the Libreboot build system, build dependencies are documented in script located at
resources/scripts/build/dependencies/ which you can install using the
Read past these sections, further down this page, to learn about specific chip types and how to wire them.
Before flashing a new ROM image, it is highly advisable that you dump the current chip contents to a file.
Run this command to see if 25xx flash is detected, with your RPi properly wired.
sudo ./flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=32768
For BBB, you must use a lower speed and a different device path:
sudo ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512
On BBB, never use a speed higher than
spispeed=512. In some cases, you may even need to go as low as
spispeed=128. The BBB is highly unstable and unreliable for SPI flashing. When you’re reading, take multiple dumps and verify that the checksums match, before you flash. You may have to flash your chip several times!
NOTE: On some systems, higher speeds will be unstable. On those systems, try lower speed like
spispeed=4096 or even
spispeed=2048 which should, in most cases, work just fine but it will obviously be slower. The
spispeed=32768 setting works just fine on most setups if you use short wires, within 10cm.
If flash chip is detected you may try reading (dumping) the flash contents now, or you can try flashing it with a new ROM.
Dump it like so (RPi):
sudo ./flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=32768 -r dump.bin
For BBB, do this:
sudo ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512 -r dump.bin
It is advisable to take a 2nd dump, e.g.
dump2.bin, and then check sha1sum:
If the checksums match, it indicates that you have a good dump. If they do not, check your wiring. Wires should be within 10cm length for best stability, and they should all be the same length (3.3V VCC and GND wires can be longer).
This advice is especially applicable to the BBB, which is highly unreliable.
Next, run this command (RPi):
sudo ./flashrom -p linux_spi:dev=/dev/spidev0.0,spispeed=32768 -w /path/to/libreboot.rom
If using BBB:
sudo ./flashrom -p linux_spi:dev=/dev/spidev1.0,spispeed=512 -w /path/to/libreboot.rom
If using BBB, you may have to use a lower speed than 512. You may also have to re-flash several times before it works fully.
Again, use a lower
spispeed value if you need to, for stability.
Once that command outputs the following, the flash has completed successfully. If not, just flash again.
Reading old flash chip contents... done. Erasing and writing flash chip... Erase/write done. Verifying flash... VERIFIED.
If it says “VERIFIED” or says that the chip contents are identical to the requested image, then the chip is properly flashed.
Refer to the above guidance about software configuration. The following advice will teach you how to wire each type of flash chip.
Do not connect a 3.3V DC power source until your chip is otherwise properly wired. For instance, do not connect a test clip that has 3.3V DC attached.
Do not disconnect your chip from the flasher until you’ve disconnected or turned off the 3.3V DC power source.
BE CAREFUL that you are indeed supplying 3.3V DC to the chip. All SPI flashes on all currently supported Libreboot hardware run on 3.3V DC and logic at that level too.
It is important to CHECK that you are running on the correct voltage, when you do anything with these chips. Lower than 3.3V won’t damage anything, but higher will fry your chip (on most chips, the tolerated voltage range is between 2.7V and 3.6V, but 3.3V is the most ideal level).
DO NOT connect more than 1 DC power source to your flash chip either! Mixing voltages like that can easily cause damage to your equipment, and to your chip/mainboard.
You may want to add 47ohm series resistors on these lines, when flashing the chips. Only do it on those lines (NOT the 3.3V or GND lines). This provides some protection from over-current. On Intel platforms, the SPI flash is usually connected via such resistors, directly to the Southbridge chipset.
ISP means in-system programming. It’s when you flash a chip that is already mounted to the mainboard of your computer that you wish to install Libreboot on.
It may be beneficial to modify the mainboard so that the SPI flash is powered (on the VCC pin) through a diode, but please note: a diode will cause a voltage drop. The tolerated range for VCC on these chips is 2.7V to 3.6V DC. If you do this, please also ensure that the WP and HOLD pins are still held to a high logic state; each via their own resistor (1K to 10K ohms) connected to the same 3.3V DC source going through the diode.
The reason is simple: on most systems, the flash shares a common 3.3V DC rail with many other components on the board, which draw a lot of current. Further, if you accidentally provide too much voltage or cause an overcurrent, you could fry those other components but if there is diode protection, you’ll only fry the boot flash (and it is very easy to replace, if you have good soldering skills).
When you’ve placed the diode, ensure that VCC on the chip is isolated from all other components on that board, which share the same 3.3V DC rail. Further, ensure that the pull-up resistors for WP/HOLD are only connected to the side of the diode that has continuity with the VCC pin (this is important because if they’re not, they won’t be held high while doing ISP flashing, even if they’re still held high when the mainboard is fully powered on).
Furthermore: ensure that the SPI flash is operating at 2.7 to 3.6V when fully powered on, after installing the diode.
If it’s a desktop/workstation/server board (not a laptop), you could de-solder the SOIC8/WSON8 if it uses that, and replace with an IC socket (for SOIC8, WSON8 or DIP8, whatever you want), because then you could easily just insert the flash into a breadboard when flashing.
TODO: Make a page on libreboot.srht.site, showing how to do this on all mainboards supported by Libreboot.
Use this image for reference when connecting the pomona to the BBB: https://beagleboard.org/Support/bone101#headers (D0 = MISO or connects to MISO).
On that page, look at the P9 header. It is what you will use to wire up your chip for flashing.
Diagram of the 26 GPIO Pins of the Raspberry Pi Model B (for the Model B+ with 40 pins, start counting from the right and leave 14 pins):
Use this as a reference for the other sections in this page, seen below:
Refer to this diagram:
|Pin #||25xx signal||RPi(GPIO)||BBB(P9 header)|
|3||not used||not used||not used|
|7||not used||not used||not used|
On your SOIC8, there will be a dot in one of the corners. The dot is pin 1.
NOTE: pins 3 and 7 are WP/HOLD pins. If flashing a chip on a breadboard, please use pull-up resistors on those (see notes below), and decoupling capacitor on pin 8 (VCC).
NOTE: On X60/T60 thinkpads, don’t connect pin 8. Instead, plug in your the PSU to the charging port on your mainboard, but do not power on the mainboard. This will provide a stable 3.3V voltage, with adequate current levels. On those laptops, this is necessary because the flash shares a common 3.3V DC rail with many other ICs that all draw quite a lot of current.
RPi GPIO header:
BBB P9 header:
Refer to this diagram:
|Pin #||25xx signal||RPi(GPIO)||BBB(P9 header)|
|1||not used||not used||not used|
|3||not used||not used||not used|
|4||not used||not used||not used|
|5||not used||not used||not used|
|6||not used||not used||not used|
|9||not used||not used||not used|
|11||not used||not used||not used|
|12||not used||not used||not used|
|13||not used||not used||not used|
|14||not used||not used||not used|
Refer to the RPi GPIO guide above, on this page.
On your SOIC16, there will be a dot in one of the corners. The dot is pin 1.
NOTE: pins 1 and 9 are WP/HOLD pins. If flashing a chip on a breadboard, please use pull-up resistors on those (see notes below), and decoupling capacitor on pin 2 (VCC).
Do this for chips mounted to a breadboard. Ignore this section if you’re flashing a chip that is already soldered to a mainboard.
This section is only relevant if you’re flashing a new chip that is not yet mounted to a mainboard. You need pull-up resistors on the WP and HOLD pins, and decoupling capacitors on the VCC pin. If the chip is already mounted to a board, whether soldered or in a socket, these capacitors and resistors will probably already exist on the board and you can just flash it without pulling WP/HOLD high, and without capacitors(just connect your external 3.3V DC power source).
The best way is as follows:
SOIC8/WSON8/DIP8: pin 3 and 7 must be held to a high logic state, which means that each pin has its own pull-up resistor to VCC (from the 3.3v voltage plane that pin 8 connects to); anything from 1Kohm to 10Kohm will do. When you’re flashing a chip that’s already on a laptop/desktop/server mainboard, pin 3 and 7 are likely already held high, so you don’t need to bother.
SOIC8/WSON8/DIP8: pin 8, which is 3.3v VCC, will already have decoupling capacitors on it if the chip is on a mainboard, but lone chip flashing means that these capacitors do not exist. A capacitor passes AC but blocks DC. Due to electromagnetic indunctance, and RF noise from high-speed switching ICs, a DC voltage line isn’t actually straight (when viewed on an oscilloscope), but actually has low voltage AC mixed in; on a particularly noisy line under high load, noise of around 300mV or more is common. To smooth out that noise, you wire capacitors from the DC line to ground, with the side of the capacitor on VCC as close to the IC’s VCC pin as possible. We recommend that you use ceramic capacitors for this purpose. The recommended capacitors for this are: 100nF and 4.7uF ceramic capacitors. Electrolytic capacitors are inferior for this, because they have higher ESR (ceramic capacitors have super low ESR, which is very good for decoupling).
The result of using a decoupling capacitor is that some of the noise on the DC line is filtered to ground, making the DC signal much cleaner/straighter (when seen on an oscilloscope).
SOIC16: same as above, but use a SOIC16 socked on a breadboard. On SOIC16, WP/HOLD are not pin 3/7 like above, but instead pins 1 and 9, so wire your pull-up resistors on those. 3.3v VCC on SOIC16 is pin 2, so wire your decoupling capacitors up on that.
If your system has lower capacity SPI flash, you can upgrade. On most systems, SPI flash is memory mapped and the maximum (in practise) that you can use is a 16MiB chip. For example, KGPE-D16 and KCMA-D8 mainboards in Libreboot have 2MiB flash by default, but you can easily upgrade these. Another example is the ThinkPad X200S, X200 Tablet and T400S, all of which have WSON8 where the best course of action is to replace it with a SOIC8 flash chip.
In all such cases, flashing a new chip should be done using a breadboard, not a test clip. You will use 2.54mm dupont leads to connect your Raspberry Pi. For data lines, make sure that all wires are the same length, and about 10cm in length (don’t use longer lengths than this).
If you go for a SOIC8, mounted it to the SOP to DIP adapter (208mil 1.27mm one) and solder 2.54mm headers to it. You could put the 2.54mm pins in a breadboard, then solder the chip to the adapter PCB and mount that to the pins on the breadboard, to keep it aligned, and solder that. Whith the PCB on the pins, and the pins in the breadboard, push the pins inwards a little bit.
This is for a new SOIC8 chip, but you can get sockets similar to the one in the video, but for WSON8. Sometimes they are called DFN8 or QFN8 sockets. Get one that is 1.27mm pitch.
If you’re flashing/dumping a lone WSON8, get a WSON8/QFN8/DFN8 socket (1.27mm pitch) and mount it to a breadboard for flashing. If your mainboard’s landing pads for the flash IC can take a SOIC8, we recommend that you use a SOIC8 instead because a test clip is possible later on when you wish to re-flash it, however you may be dealing with a board where replacing existing WSON8 with SOIC8 is desirable; in that case, you might still want to dump the contents of the original WSON8.
Here is a SOIC8 in a socket, mounted to a breadboard, for flashing:
Here is a photo of a DIP8 IC:
Here is a photo of a SOIC8 in 1.27mm 208mil SOP to DIP adapter:
NOTE: DIP8 and WSON8-in-socket, and SOIC16-in-socket, are basically the same, just adapt accordingly.
If you’re replacing a DIP8 but using SOIC8 on an adapter, solder it to the adapter first, then insert 2.54mm headers (square pins) into a breadboard to keep them aligned. Put the SOIC8 on the PCB, onto the pins, and push the pins inwards a little bit, and solder that. Alternatively to the breadboard, you can just put the 2.54mm pins directly in the DIP8 socket and mount the SOIC8 + adapter onto that, and solder that. Use quality rosin flux (not acid based) and good 60/40 or 63/37 leaded solder (don’t use lead-free):
This is an example of in-system programming or ISP for short.
Pomona 5250 is a SOIC8 test clip. There are others available, but this is the best one. Use that. Use the SOIC8 diagram (see above) to wire up your Raspberry Pi. Your mainboard likely already pulls WP/HOLD (pins 3 and 7) high, so don’t connect these. 3.3v VCC on SOIC8’s pin 8 probably already has decoupling capacitors on the mainboard, so just hook that up without using a capacitor.
Pomona 5252 is a SOIC16 test clip. There are others available, but this is the best one. Use that. Use the SOIC16 diagram (see above) to wire up your Raspberry Pi. WP/HOLD pins are pins 1 and 9, and likely already held high, so no pull-up resistors needed. You do not need a decoupling capacitor for pin 2 (VCC) either because the mainboard will already have one.
Here is an example of a test clip connected for SOIC16:
And here is an example photo for SOIC8:
It is extremely cursed for DIP8 to be soldered directly to the mainboard. It is usually mounted to a socket.
The pins are large enough that you can just use test hooks to wire up your chip for flashing. You might want to de-solder the chip, using a solder vacuum (extractor) tool, and then you can install a socket in its place. You can then insert the DIP8 IC into the socket.
In the Libreboot project, we have never heard of a board where the DIP8 is directly soldered. It is almost always mounted in a socket.
Your DIP8 IC has the same pinout as a SOIC8 IC.
You can connect a SOIC8 test clip, but you will struggle to get good connections and it will be extremely unreliable. DO NOT solder to the pads of the WSON8 directly; some people do this, but you shouldn’t do it, because you can easily damage the pads that way.
WSON8 has the same pinout as SOIC8, but it’s a ball mounted QFN (quad flat pack, no leads). There are no clips for it. Sometimes referred to as QFN8
On all currently supported Libreboot hardware, boards that have WSON8 can also have a SOIC8 because the pads are long enough to accomodate either type of chip.
A good choice of soldering iron would be a T12-D08 or T12-K tip, on a T12 soldering station. KSGER makes nice soldering stations:
The case on that KSGER station is not grounded by default, so you should modify it to ground the case, in case of an electrical fault. This is for your safety. This video shows how to do it:
Use quality 60/40 or 63/37 lead+tin solder. Do not use lead-free! Lead-free is not suitable for hobbyist use such as this. Use quality rosin flux. Fluxes with an acid base should never be used. Amtech and MG Chemicals make good flux pastes. Use it in a dispenser tube. Some of these fluxes will contain adapic acid which has a low pH level, and it is simply used as a mild activator. So long as you clean the flux afterwards, you should be fine.
Make sure to have a copper wire brush and a wet sponge handy. You wipe the iron on the wire brush and tap it on the wet sponge(to remove oxides) to keep it clean. Always clean your tip constantly. Also, after cleaning it, always re-tin the tip with fresh solder, to prevent the tip from oxidizing!
Make sure to buy 99.9% isopropyl alcohol. Don’t buy weaker solutions because they contain water, and don’t use other chemicals because most other chemicals are corrosive. You use the isopropyl to clean the area you’re soldering, before soldering it, and then soak up the wet alcohol with a cloth. You will also use it to clean off any flux that you used.
Use of flux is very important, to get a good solder joint, because it removes oxides and prevents further oxidation during soldering, ensuring that the solder flows properly, otherwise the solder will ball up and you won’t get a good joint.
In case you’re not comfortable with soldering, we have some excellent videos linked on the FAQ page which you can watch.
Surround a large area around the chip with layers of kapton tape, and then aluminium foil. This will act as a heat shield, to reduce the risk of re-flowing other solder joints (which can make them turn into cold joints, and you risk knocking them off of the board):
Notice that the kapton+foil does not cover the chip itself, or the solder pads. It’s important that these are exposed to the heat.
Use a hot air rework station, set to about 330-340C. The reason for the higher temperature is because air doesn’t conduct heat as efficiently as an iron, so you must use a higher temperature. You should put lots of rosin flux above the IC. Do not hold the nozel too close to the board. The diameter of the nozel should be slightly higher than the length of the chip. Apply even heat, at high air flow.
While blasting the chip with hot air, hold the chip with tweezers but do not use any real force. Do not try to forcefully pry off the chip. Simply hold the chip with your tweezers, gently nudging it until it feels like the chip can move freely. While in this state, the solder is fully melted and the chip can be lifted off with ease.
If you’re doing it correctly, the chip will come off within 1 minute, like so:
Add fresh solder to the pads, including the thermal pad:
Now wick it out using a copper braid, dunked in rosin flux:
Ensure that all of the solder is removed:
You will notice that one of the pads doesn’t have all of the solder removed. The pad on the top-left in this photo. This is intentional, to show you a comparison for reference. The other pads are free of solder.
You can simply solder the chip unflashed, and flash it using a test clip. Alternatively, you can put the SOIC8 in a socket on a breadboard, and flash it before soldering it. If you wish to dump the contents of the WSON8, you can put the removed WSON8 in a socket on a breadboard and dump it using your SPI flasher.
Align the new SOIC8, and tack it in the corner pins. Then solder it fully. Use lots of flux!
A T12-D08 tip is being used in this photo, but a mini chisel, mini hoof or knife (e.g. T12-K) tip would be ideal.
Ensure that all the joints are perfect. A good solder joint is shiny, and with concave fillets where the solder has flowed. Observe:
After you’re done, use a soft bristle brush and 99.9% isopropyl alcohol to break up the remaining flux, then soak up the flux using a cloth, while the alcohol is still wet. 99.9% isopropyl is the best liquid to use, because it evaporates quickly and it does not leave a corrosive residue.
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