[PATCH, v2] bootm: Pass SMP core ID and DTB address for ELF-formatted kernels

[牛 志宏]

When booting RISC-V ELF-formatted kernel images (IH_TYPE_KERNEL + IH_OS_ELF),
explicitly pass SMP hart ID (via a0/argc) and DTB address (via a1/argv)
to comply with modern SMP-enabled kernels' boot protocol requirements.
See https://www.kernel.org/doc/html/latest/arch/riscv/boot.html#register-state

Signed-off-by: Zone.N <zone.niuzh at hotmail.com>
---
boot/bootm_os.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/boot/bootm_os.c b/boot/bootm_os.c
index a3c7cb5332e..d95477f1344 100644
--- a/boot/bootm_os.c
+++ b/boot/bootm_os.c
@@ -402,6 +402,17 @@ static int do_bootm_elf(int flag, struct bootm_info *bmi)
if (flag != BOOTM_STATE_OS_GO)
return 0;
+/*
+ * Required per RISC-V boot protocol:
+ * a0(argc) = hartid of the current core
+ * a1(argv) = address of the devicetree in memory
+ * https://www.kernel.org/doc/html/latest/arch/riscv/boot.html#register-state
+ */
+#if defined(CONFIG_RISCV)
+ bmi->argc = gd->arch.boot_hart;
+ bmi->argv = (char **)bmi->images->ft_addr;
+#endif
+
bootelf(bmi->images->ep, flags, bmi->argc, bmi->argv);
return 1;
--
2.45.2