On Mon, Dec 09, 2024 at 10:44:40PM -0600, Samuel Holland wrote: > 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 When I added a header like this for the bpi I needed the text offset to be 0x200000, like Linux has it. Did you do something to avoid that? > + .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) > Thanks, drew
