On Fri, 22 Mar 2019 at 02:10, Thierry Reding thierry.reding@gmail.com wrote:
From: Thierry Reding treding@nvidia.com
If early firmware initialized the display hardware and the display controllers are scanning out a framebuffer (e.g. a splash screen), make sure to pass information about the memory location of that framebuffer to the kernel before booting to avoid the kernel from using that memory for the buddy allocator.
This same mechanism can also be used in the kernel to set up early SMMU mappings and avoid SMMU faults caused by the display controller reading from memory for which it has no mapping.
Signed-off-by: Thierry Reding treding@nvidia.com
board/nvidia/p2771-0000/p2771-0000.c | 66 ++++++++++++++++++++++++++-- 1 file changed, 62 insertions(+), 4 deletions(-)
Reviewed-by: Simon Glass sjg@chromium.org