On Fri, Mar 04, 2022 at 04:30:11PM +0000, Andre Przywara wrote:
The FVP base model is relying on a DT for Linux operation, so there is no reason we would need to rely on hardcoded information for U-Boot. Letting U-Boot use a DT will open up the usage of actual peripherals, beyond the support for semihosting only.
Enable OF_CONTROL in the Kconfig, and use the latest dts files from Linux. Depending on whether we use the boot-wrapper or TF-A, there is already a DTB provided or not, respectively.
To cover the boot-wrapper, we add an arm64 Linux kernel header, which allows the boot-wrapper to treat U-Boot like a Linux kernel. U-Boot will find the pointer to the DTB in x0, and will use it.
Even though TF-A carries a DT, at the moment this is not made available to non-secure world, so to not break users, we use the U-Boot provided DTB copy in that case. For some reason TF-A puts some DT like structure at the address x0 is pointing at, but that is very small and doesn't carry any hardware information. Make the code to ignore those small DTBs.
Signed-off-by: Andre Przywara andre.przywara@arm.com
arch/arm/Kconfig | 2 ++ arch/arm/dts/Makefile | 1 +
board/armltd/vexpress64/Kconfig | 8 ++++++-- board/armltd/vexpress64/vexpress64.c | 8 +++++++- configs/vexpress_aemv8a_semi_defconfig | 2 +- 5 files changed, 17 insertions(+), 4 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 34dbd73cce..afb42e62d8 100644
Applied to u-boot/next, thanks!