On Fri, 3 Sept 2021 at 07:16, Thierry Reding thierry.reding@gmail.com wrote:
From: Thierry Reding treding@nvidia.com
The EMC frequency tables are created from a training sequence performed during early boot and passed in via a reserved memory region by nvtboot. Copy this table to the kernel DTB so that the kernel can use it to scale the EMC frequency at runtime.
Note that early bootloaders store the EMC table at an address that currently intersects with the load address of the initial ramdisk. In order to avoid copying the table to a different address, simply change the load address for the initial ramdisk in U-Boot.
Signed-off-by: Thierry Reding treding@nvidia.com
board/nvidia/p2371-2180/p2371-2180.c | 1 + board/nvidia/p3450-0000/p3450-0000.c | 1 + include/configs/tegra210-common.h | 2 +- 3 files changed, 3 insertions(+), 1 deletion(-)
Reviewed-by: Simon Glass sjg@chromium.org
diff --git a/board/nvidia/p2371-2180/p2371-2180.c b/board/nvidia/p2371-2180/p2371-2180.c index f5126c552b00..cd5dc2de629e 100644 --- a/board/nvidia/p2371-2180/p2371-2180.c +++ b/board/nvidia/p2371-2180/p2371-2180.c @@ -183,6 +183,7 @@ static void ft_carveout_setup(void *fdt) static const char * const nodes[] = { "/host1x@50000000/dc@54200000", "/host1x@50000000/dc@54240000",
"/external-memory-controller@7001b000", };
This would be better added to the DT in 'sysinfo' driver or something like that. It is not nice to have DT paths in the C code.
- Simon