This allows flat binaries to be understood by U-Boot's booti command and its PXE boot flow. Signed-off-by: Samuel Holland <samuel.holland@xxxxxxxxxx> --- riscv/cstart.S | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/riscv/cstart.S b/riscv/cstart.S index b7ee9b9c..106737a1 100644 --- a/riscv/cstart.S +++ b/riscv/cstart.S @@ -39,15 +39,29 @@ * The hartid of the current core is in a0 * The address of the devicetree is in a1 * - * See Linux kernel doc Documentation/riscv/boot.rst + * See Linux kernel doc Documentation/arch/riscv/boot.rst and + * Documentation/arch/riscv/boot-image-header.rst */ .global start start: + j 1f + .balign 8 + .dword 0 // text offset + .dword stacktop - ImageBase // image size + .dword 0 // flags + .word (0 << 16 | 2 << 0) // version + .word 0 // res1 + .dword 0 // res2 + .ascii "RISCV\0\0\0" // magic + .ascii "RSC\x05" // magic2 + .word 0 // res3 + /* * Stash the hartid in scratch and shift the dtb address into a0. * thread_info_init() will later promote scratch to point at thread * local storage. */ +1: csrw CSR_SSCRATCH, a0 mv a0, a1 -- 2.39.3 (Apple Git-146)
