Enable caches for the RPi2
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- v2 Latest posting 3/30 of 5 patches 0 repliesNew
- v2 posting 2/30 of 5 patches 0 repliesSuperseded
- v2 posting 1/30 of 5 patches 0 repliesSuperseded
Patches in v2 posting 3/3 No applies recorded yet
None of the 5 patches the cover letter announces are in this archive.
Reviews trailers per patch
No Reviewed-by, Acked-by or Tested-by trailers for v2 yet.
Cover letter [U-Boot] [PATCH v2 0/5] Enable caches for the RPi2
Quoted 10 lines · Alexander Graf
This patch set converts the Raspberry Pi 2 system to properly make use of the caches available in it.
Because we're running in HYP mode, we first need to teach U-Boot how to make use of HYP registers and the LPAE page layout which is mandated by hardware when running in HYP mode.
Then while we're at it, also mark the frame buffer cached to speed up screen updates.
Quoted 6 lines
With this patch set, my Raspberry Pi 3 running in AArch32 mode is a *lot* faster than without.
Please verify that the code works on a RPi2 as well and doesn't break the original Pi. In theory it should work, but I only have a 3 to test on available here.
I did find one quirk with this series (as tested in my rpi_dev branch on github): HDMI console scrolling is now extremely fast for 32-bit builds. However, it's noticeably slower on the 64-bit RPi 3 build. I wonder if the DCACHE_* constants aren't optimal for AArch64? Perhaps this can all be explained instead by RPi 3 needing a slower core clock to support a fixed mini UART frequency; that probably slows down the ARM access to DRAM.