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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 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.patra@wdc.com> Reviewed-by: Rick Chen <rick@andestech.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Tested-by: Bin Meng <bmeng.cn@gmail.com>
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@ -28,6 +28,28 @@ __weak void board_quiesce_devices(void)
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int arch_fixup_fdt(void *blob)
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{
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#ifdef CONFIG_EFI_LOADER
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int err;
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u32 size;
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int chosen_offset;
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size = fdt_totalsize(blob);
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err = fdt_open_into(blob, blob, size + 32);
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if (err < 0) {
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printf("Device Tree can't be expanded to accommodate new node");
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return err;
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}
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chosen_offset = fdt_path_offset(blob, "/chosen");
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if (chosen_offset < 0) {
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err = fdt_add_subnode(blob, 0, "chosen");
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if (err < 0) {
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printf("chosen node can not be added\n");
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return err;
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}
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}
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/* Overwrite the boot-hartid as U-Boot is the last stage BL */
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fdt_setprop_u32(blob, chosen_offset, "boot-hartid", gd->arch.boot_hart);
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#endif
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return 0;
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}
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