On 03/16/2016 08:41 AM, Alexander Graf wrote:
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.
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.
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