forked from Mirrors/opensbi
6019259dfb
The T-HEAD C90x PLIC has some special quirks, such as the S-mode delegation bit. OpenSBI currently handles this by checking the compatible string in the device tree. However, this matching is done in the order of the fdt_match array. So if a device tree contains both strings, for example: compatible = "thead,c900-plic", "riscv,plic0"; Then OpenSBI will match against the generic "riscv,plic0" string, since that appears first in the fdt_match array. This means it will fail to set the S-mode delegation bit, and Linux will fail to boot. In some cases, it is not possible to change the compatible string to just the T-HEAD PLIC, as older versions of Linux only recognize the RISC-V compatible string. This patch fixes that by moving the RISC-V string to the end, ensuring that the more specific options get matched first. Signed-off-by: Alex Studer <alex@studer.dev> Reviewed-by: Anup Patel <anup@brainfault.org>