strap timings

[Perfect-Web]

do you know if is possible (or how) to change memory strapping times ?

[kobalicek]

I started working on this but haven't finished yet. The binlib.js first needs some support for data that is not fixed and requires some code instead of definitions.

[tacchinotacchi]

Is it even possible to change the straps without modding the bios?

[kobalicek]

I'm not aware of that. Straps are defined in VBIOS and AMD drivers don't provide any access to them. You can try to modify the driver though as it's open source.

[MoneroCrusher]

Hello,
I have reason to believe the timing straps are located in sys/kernel/debug/dri/yourcardnumber/amdgpu_regs, however, when I try to copy, modify or decode it, I get errors and kernel panics (and kinda wrong looking hex code when I manage to hexdump it). Can you maybe look into it, and maybe get in contact with me via chat? If so, leave your username on platform of choice.

[kobalicek]

Hello, I cannot really help as I don't have AMD GPUs anymore. I have already worked with the driver and failed to do what I wanted to do so my motivation to try that again is basically zero (I tried to add undervolting support to sysfs and had a lot of problems with just that).

I don't think you can change strap timings by using debugfs, you would most probably really need to change the driver itself, which is a pain in the ass if you are not used to work on linux drivers. Maybe somebody else here knows more and can help, will keep open.

[MoneroCrusher]

For some reason changing voltage works well for my rx polaris cards!
Btw..is it possible to overwrite ROM completely to avoid having to flash the card?

[Lucie2A]

Hi,

there is now way to 'soft-write' the ROM on the fly.
You DO need to flash the card.
You can only 'soft-write' the PP-Table.

Best regards,

Samuel

[heavyarms2112]

@Lucie2A modifying pp-table will not alter the RAM timings afaik.

[MoneroCrusher]

@Lucie2A
Ok, thanks for the info.
Do you happen to have a version of atiflash higher than v4.25? 4.25 doesn't support flashing Lexa Pro based GPUs.
Or do you happen to know another way?
Or are you good with timung straps? I manage to overwrite them but it crashes the GPU (with amd-umr)

[Lucie2A]

Hi,

@heavyarms2112 : Yep, pp-table doesn't include memory timings. pp-tables include power limits, fan regulation, several thermal threshold, mem/gpu/control chip freq states, mem/gpu/control chip voltage states. Memory timings are found elsewhere in the bios.

@MoneroCrusher : Memory timings editor: there is a lot of tools for that (Rx 400 and Rx 500 series). Search the web with google. Take care of memory version included on your GPU card. There isn't such a tool for Rx VEGA as bios need to be digitally signed.

amdtweak is for pp-table only.
kobalicek version work fine for Rx400 Rx500 series. My forked version also work for Rx VEGA (with driver 18.20).

Best regards