6.19/misc: BC-250 40 CU unlock (gfx1013 harvest bypass)#159
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Re-enable all 40 harvested CUs on the AMD BC-250 (gfx1013 / Cyan Skillfish) via CC_GC_SHADER_ARRAY_CONFIG + SPI_PG_ENABLE_STATIC_WGP_MASK writes during amdgpu CU enumeration. Controlled by module parameter amdgpu.bc250_cc_write_mode=3 (default off). Guarded by PCI device ID 0x13FE (BC-250 only). Verified 1.61x compute scaling at 1500MHz (pp512: 230 -> 372 tok/s). Reference: https://github.com/duggasco/bc250-40cu-unlock Signed-off-by: duggasco <duggasco@gmail.com> Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Uses amdgpu_gfx_parse_disable_cu + mutex_lock as context anchors instead of absolute line numbers. Applies cleanly across kernel versions. Added to 6.17 and 6.18 in addition to 6.19. Signed-off-by: duggasco <duggasco@gmail.com> Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Fixes "malformed patch" error on CachyOS kernel builds. Signed-off-by: duggasco <duggasco@gmail.com> Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Add a patch to re-enable all 40 harvested CUs on the AMD BC-250 (gfx1013 / Cyan Skillfish / salvaged PS5 APU).
The BC-250 ships with 24 of 40 RDNA2 CUs active. This patch writes two hardware registers during
gfx_v10_0_get_cu_info()to unlock all 40:Both are required — neither alone produces compute scaling. Controlled by
amdgpu.bc250_cc_write_mode=3(default off). Guarded by PCI device ID0x13FE.Verified Results
4-state A/B test (same board, same model, Vulkan llama-bench pp512):
At 1500MHz/900mV sweet spot: 230 → 372 tok/s = 1.61x with 83C peak.
Safety
bc250_cc_write_mode=0)0x13FE= BC-250 only)Reference