Some architectures use a cached framebuffer and flush the cache as needed
so that changes are visible. This is supported by U-Boot.
However x86 uses an uncached framebuffer with a 'write-combining' feature
to speed up writes. Reads are permitted but they are extremely expensive.
Unfortunately, r
On Tue, 19 May 2020 17:10:41 -0600
Simon Glass s...@chromium.org wrote:
> Some architectures use a cached framebuffer and flush the cache as needed
> so that changes are visible. This is supported by U-Boot.
>
> However x86 uses an uncached framebuffer with a 'write-combining' feature
> to speed
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