diff options
Diffstat (limited to 'src/arch/riscv/bootblock.S')
| -rw-r--r-- | src/arch/riscv/bootblock.S | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/arch/riscv/bootblock.S b/src/arch/riscv/bootblock.S index 43bca907bb..0b5a2b2961 100644 --- a/src/arch/riscv/bootblock.S +++ b/src/arch/riscv/bootblock.S @@ -25,7 +25,14 @@ .globl _start _start: - + # The boot ROM may pass the following arguments to coreboot: + # a0: the value of mhartid + # a1: a pointer to the flattened devicetree + # + # Preserve only the FDT pointer. We can query mhartid ourselves at any + # time. + # + csrw mscratch, a1 # N.B. This only works on low 4G of the address space # and the stack must be page-aligned. |