[PATCH v2 0/2] Fix sdram size detection on RK3568 and RK3588

Jonas Karlman jonas at kwiboo.se
Tue Feb 7 18:27:10 CET 2023

DRAM initialization blobs for rk356x and rk3588 from vendor encode sdram
info in a new version 3 format. The new format makes use of more bits in
sys_reg3 compared to the version 2 format. RK3588 blob also encode
information on sdram channel 3+4 in sys_reg4+5 using the same format.

This series adds support for decoding basic information from this new
version 3 format. It also adds support for adding a second dram bank
with any usable memory beyond the 4GB mark.

With these patches my Radxa ROCK 3 Model A 2GB correctly report 2GB of
DRAM, instead of 4GB, and my 8GB board can make full use of its memory.
My Radxa ROCK 5 Model B 8GB also correctly report and can make full use
of its 8GB of DRAM with these patches.

Changes in v2:
- Added a note on RK3588 blobs use of sys_reg4+5 to cover letter

Jonas Karlman (2):
  rockchip: sdram: add basic support for sdram reg info version 3
  rockchip: sdram: add dram bank with usable memory beyond 4GB

 arch/arm/include/asm/arch-rockchip/sdram.h | 28 +++++++++++++++-------
 arch/arm/mach-rockchip/sdram.c             | 21 ++++++++++++----
 2 files changed, 35 insertions(+), 14 deletions(-)


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