Polaris Bios Editor for the console (Linux/MacOS/Windows, etc.)

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WARNING: Running a modified BIOS will most likely void your GPU warranty and could potentially destroy your GPU. By using this software you agree to full responsibility for any results to your hardware.

Common commands:

Show help:

./pbec

or

./pbec --help

Viewing ROM details:

Print all info in summary:

./pbec -i support/test.rom -s -r ALL

Print only timing strap info:

./pbec -i support/test.rom -s -r VRAM_TIMING

Print all info in full (decimal and hex where relevant):

./pbec -i support/test.rom -f -r ALL

Timing Straps

Copying:

Copying timing straps from array 0 to arrays 1, 2, 3 from support/test.rom to test2.rom:

./pbec -i support/test.rom -c 0 -p 1 2 3 -o test2.rom

Editing:

You can also specify the hexadecimal byte form of a timing strap from the command line using the -n option. The length of the strap should be 96 hexadecimal characters (0-9, a-f).

The following example sets the timing strap in array position 1 to the value specified.

./pbec -i support/test.rom -o test3.rom -n aaaaaaaaaabbbbbbbbbbcccccccccc333333333344444444445555555555666666666677777777778888888889abcdef -p 1

Building:

Prerequisites:

MacOS

Install the gcc compiler tools:

xcode-select --install

Ubuntu

apt-get -y install gcc make g++

Centos/Fedora

yum install gcc gcc-c++

To build:

make clean && make

To run:

./pbec ...

To run tests:

./tests

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To build and run tests under different Linux flavours using Docker:

Ubuntu 16.04:

make dockerbuild-ubuntu1604

Fedora 27:

make dockerbuild-fedora27

This will make the binaries in your host as it uses a mounted volume to the source directory.

Other details:

Header information taken from the linux source for the AMD drivers at:

https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/radeon/atombios.h