On Tue, Mar 3, 2020 at 11:59 PM Rick Chen <rickche...@gmail.com> wrote: > > Hi Atish > > > From: U-Boot [mailto:u-boot-boun...@lists.denx.de] On Behalf Of Atish Patra > > Sent: Friday, February 28, 2020 5:01 AM > > To: u-boot@lists.denx.de > > Cc: Atish Patra; Alexander Graf; Anup Patel; Bin Meng; Joe Hershberger; > > Loic Pallardy; Lukas Auer; Marek Behún; Marek Vasut; Patrick Delaunay; Peng > > Fan; Philippe Reynes; Simon Glass; Simon Goldschmidt; Stefano Babic; > > Thierry Reding; tr...@konsulko.com; Heinrich Schuchardt; Ard Biesheuvel; > > l...@nuviainc.com; abner.ch...@hpe.com; daniel.schae...@hpe.com > > Subject: [v1 PATCH 1/1] riscv: Add boot hartid to Device tree > > > > Linux booting protocol mandates that register "a0" contains the hartid. > > However, U-boot can not pass the hartid via a0 during via standard UEFI > > protocol. DT nodes are commonly used to pass such information to the OS. > > > > Add a DT node under chosen node to indicate the boot hartid. EFI stub in > > Linux kernel will parse this node and pass it to the real kernel in "a0" > > before jumping to it. > > > > Signed-off-by: Atish Patra <atish.pa...@wdc.com> > > --- > > arch/riscv/lib/bootm.c | 13 +++++++++++++ > > 1 file changed, 13 insertions(+) > > > > diff --git a/arch/riscv/lib/bootm.c b/arch/riscv/lib/bootm.c index > > fad16901c5f2..dd359a45c2e1 100644 > > --- a/arch/riscv/lib/bootm.c > > +++ b/arch/riscv/lib/bootm.c > > @@ -28,6 +28,19 @@ __weak void board_quiesce_devices(void) > > > > int arch_fixup_fdt(void *blob) > > { > > + u32 size; > > + int chosen_offset, err; > > + > > + size = fdt_totalsize(blob); > > + err = fdt_open_into(blob, blob, size + 32); > > + if (err < 0) { > > + printf("Device Tree can't be expanded to accommodate new > > node"); > > + return -1; > > + } > > + chosen_offset = fdt_path_offset(blob, "/chosen"); > > + fdt_setprop_u32(blob, chosen_offset, "boot-hartid", > > + gd->arch.boot_hart); > > Is it also OK for RV64 ? >
Yes. I have tested it. To make it compatible for both 32 bit & 64 bit, I have chosen a 32bit property which allows the max hartid to be 2^32-1 which should be sufficient. > Other than that, > Reviewed-by: Rick Chen <r...@andestech.com> > > > + > > return 0; > > } > > > > -- > > 2.24.0 > > -- Regards, Atish
