[XS] Change in coreboot[main]: arch/riscv/boot.c: Add comment for clarity

[Maximilian Brune (Code Review)]

Attention is currently required from: Philipp Hug, ron minnich.

Maximilian Brune has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/79949?usp=email )

Change subject: arch/riscv/boot.c: Add comment for clarity
......................................................................

arch/riscv/boot.c: Add comment for clarity

It simply adds a comment to indicate to the reader that the
RISCV_PAYLOAD_MODE_S parameter causes OpenSBI to switch to Supervisor
mode. Otherwise it could be interpreted that coreboot switches to
Supervisor mode before starting OpenSBI (which is not the case)

Signed-off-by: Maximilian Brune 
Change-Id: Ib62be0c2ff59361200df4c65f9aca5f7456a0ada
---
M src/arch/riscv/boot.c
1 file changed, 4 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/49/79949/1

diff --git a/src/arch/riscv/boot.c b/src/arch/riscv/boot.c
index a59f9d1..6f744d3 100644
--- a/src/arch/riscv/boot.c
+++ b/src/arch/riscv/boot.c
@@ -31,10 +31,12 @@
    	fdt = prog_entry_arg(prog);

if (ENV_RAMSTAGE && prog_type(prog) == PROG_PAYLOAD) {
-		if (CONFIG(RISCV_OPENSBI))
+		if (CONFIG(RISCV_OPENSBI)) {
+			// tell OpenSBI to switch to Supervisor mode before jumping to payload
    		run_payload_opensbi(prog, fdt, args->opensbi, RISCV_PAYLOAD_MODE_S);
-		else
+		} else {
    		run_payload(prog, fdt, RISCV_PAYLOAD_MODE_S);
+		}
    } else {
    	void (*doit)(int hart_id, void *fdt, void *arg) = prog_entry(prog);
    	doit(hart_id, fdt, prog_entry_arg(prog));