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When working with low-voltage chips, the internal 10k pull-ups of the Bus Pirate might be too high. In such cases, it's necessary to create an external pull-up using lower-value resistors. For this, you can use the 'hiz' parameter. This way, the Bus Pirate will operate as an open drain with 'pullups=off' So, why not just use the 'pullups=on' option for this scenario? I'm trying to prevent a very typical human error in the training sessions I conduct. For example, in the previous session, a user might have left the VPU (vextern) connected to 5V, and now they need to access a 1.8V chip. If 'pullups=on' is used, the following will happen: 5V (VPU) --> CD4060 --> 2K (internal Bus Pirate) --> MOSI target chip. By having the option to set a 'hiz=on', this can be avoided. Since the pull-ups will remain deactivated while the Bus Pirate will function in an open-drain mode Return init error for invalid values of pullups, hiz, psus. Previously, invalid values of the params pullups, hiz, psus were handled as "off" (i.e. disabled). This created a potential human error when users were running flashrom with e.g. pullups=1 and expected pullups to be on, while the value 1 was handled as invalid and off. Change-Id: I6d9909b23782ef3fcb1428fd127dae0d6b211855 Signed-off-by: David Reguera Garcia <dreg@rootkit.es> Reviewed-on: https://review.coreboot.org/c/flashrom/+/79299 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
flashrom README
===============
flashrom is a utility for detecting, reading, writing, verifying and erasing
flash chips. It is often used to flash BIOS/EFI/coreboot/firmware images
in-system using a supported mainboard, but it also supports flashing of network
cards (NICs), SATA controller cards, and other external devices which can
program flash chips.
It supports a wide range of flash chips (most commonly found in SOIC8, DIP8,
SOIC16, WSON8, PLCC32, DIP32, TSOP32, and TSOP40 packages), which use various
protocols such as LPC, FWH, parallel flash, or SPI.
Do not use flashrom on laptops (yet)! The embedded controller (EC) present in
many laptops might interact badly with any attempts to communicate with the
flash chip and may brick your laptop.
Please make a backup of your flash chip before writing to it.
Please see the flashrom(8) manpage :doc:`classic_cli_manpage`.
Building / installing / packaging
---------------------------------
flashrom supports building with **make** and **meson**.
TLDR, building with meson
"""""""""""""""""""""""""
::
meson setup builddir
meson compile -C builddir
meson test -C builddir
meson install -C builddir
For full detailed instructions, follow the information in
:doc:`dev_guide/building_from_source`
TLDR, building with make
""""""""""""""""""""""""
::
make
make install
For full detailed instructions, follow the information in
:doc:`dev_guide/building_with_make`
Contact
-------
The official flashrom website is:
https://www.flashrom.org/
For available contact methods see :doc:`contact`