22 Aug
2022
22 Aug
'22
6:39 p.m.
Hi Antoine,
On Fri, 19 Aug 2022 at 08:08, Antoine Mazeas antoine@karthanis.net wrote:
The RPI firmware adjusts several property values in the dtb it passes to u-boot depending on the board/SoC revision. Inherit some of these when u-boot loads a dtb itself. Specificaly copy:
- /model: The firmware provides a more specific string
- /memreserve: The firmware defines a reserved range, better keep it
- emmc2bus and pcie0 dma-ranges: The C0T revision of the bcm2711 Soc (as present on rpi 400 and some rpi 4B boards) has different values for these then the B0T revision. So these need to be adjusted to boot on these boards
- blconfig: The firmware defines the memory area where the blconfig stored. Copy those over so it can be enabled.
- /chosen/kaslr-seed: The firmware generates a kaslr seed, take advantage of that.
Signed-off-by: Sjoerd Simons sjoerd@collabora.com Signed-off-by: Antoine Mazeas antoine@karthanis.net
board/raspberrypi/rpi/rpi.c | 48 +++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+)
Reviewed-by: Simon Glass sjg@chromium.org
I wonder if anyone has tried to drop the private firmware on the boards?
At some point copy_property() should move to fdt_support.c if others use it