In this case I'm not sure if I'll release it.  It's looking like it won't take a lot of experimenting to figure out though.
https://github.com/torvalds/linux/blob/5924bbecd0267d87c24110cbe2041b5075173a25/drivers/gpu/drm/amd/include/asic_reg/gmc/gmc_8_1_d.h#L73

It's almost information overload though...  And I still find organizing the CUs into engines and shader groups confusing.  I'd just number them from 0..


p.s. I'm finding it seems to have copied the out-of-date register bitfields used in the kernel.  For example mmMC_ARB_RFSH_RATE supposedly only uses the lower 8 bits for powermode0, but I'm seeing values in the upper 16 bits too.

Which card has this timing string for 1500 strap?
I only saw this timing string for 1375 strap in Elpida EDW4032BABG in R9 290X/380/390/390X.
Decoding for MC_SEQ_MISC_TIMING looks wrong (at least not consistent with decoding of timing string for the same strap and memory type in RX).
MC_SEQ_MISC_TIMING2 looks wrong too, the way a see it (my tool does not work with timing strings only tables and bioses, so some hacks):

EDIT: MC_ARB_DRAM_TIMING2, MC_ARB_DRAM_TIMING looks misaligned too.
Or at least i think 59283315 should be decoded as 89, 40, 51, 21.

Good catch.  It's the 1500 strap in my custom Tonga BIOS, which I originally copied from the 1375 strap.  I'll double-check my mods to the decode tool with your atom_rom_timings code to see if I can find the bug(s).

Well my knowledge is (at least partially) from statistical analysis, so 'all atombios timing tables in existence' database is a nice by-product.

Question to gurus unrelated to timings.
It seems most (all?) RX 460 (not a sane choice for mining) in addition to empty I2C VO also contain GPIO VO of type 2(aka mvddc).
Raw voltage values in this object is 1350/1500 and at least to me it looks like mvddc.
Did somebody already looked at it already?

Micron:
You can find posts saying you can achieve 30mh with using 1750 strap above 2050MHz, but the micron cards that I tested were all unstable above 1950. No wonder the manufacturers limited even the 8GB versions to only 1650MHz...
Is there such a big variance among micron chips?

For which kind of card/memory is that strap?

After reading OC.net hawaii bios editing post, and reading this post a few times, I've tried to learn to do it myself. Before starting to learn about custom timing, i've just copied lower clock timings into higher ones, with gains around 5% at same gpu/mem clocks, not bad. I'll try to explain how I did it, because it's been hard for me to understand at first how to do it, so I hope it helps other ppl.

Everything done under windows (I have ubuntu also, but i find myself more comfortable in windows, dont kill me for it).

First of all, I downloaded both original BIOS using GPU-Z (Button right to BIOS version). Save them as backup.

Then, open the one you want to modify with Hex Workshop
It looks (correct me please if I'm wrong), that some of the Hawaii timings use to start with 77 71 (that's been the case for my Hynix AJR), so I made a search (Ctrl+F) for Hex Values 7771.


Then, look at the 4 pair of numbers before the 77 71 pairs, select them with mouse and look at the right column "Data Inspector" for the int32 value, thats the Mhz of the memstrap
multiplied by 100. If you want to find the rest of the straps, put mouse cursor before 77 and add an offset (Ctrl+G) of 48 bytes (thats the case for my BIOS/memory type, if its not the case, search for the next 77 71 and use 4 pairs before).

For a R9 390X bios with Hynix AJR, straps are 800-900-1000-1125-1250-1375-1425-1500-1625-1750-2000.

So for this BIOS, i chose to copy the 1250 memstrap into the 1375,1425,1500 and 1625 ones. 1250 memstrap for me is this one: 77713320000000008CC5583460550F0F2C94B8070048C50022FF1C085C0F14205A8900A00000012 0120D23287B222D13



After this, you can also mod gpu/mem clocks, voltages and fan speed with HawaiiBiosReader

With all these changes you will need to fix BIOS checksum. Use the .exe OhGodACsumFixer.exe posted in OP by opening it with cmd. Just paste .exe in the same dir as the bios, go there with an administrator plivilege cmd and type OhGodACsumFixer.exe BIOSNAME. Check if checksum is OK using HawaiiBiosReader.



I'm totally a noob at this so please, correct me if im wrong. I haven't tried any bios with more than 1 memory type, that could change some values, so please, be careful.

Just updated the tool with the R9 code.


For a distro, I'd suggest Ubunutu 16.04.2.