[U-Boot] [PATCH V2] Cleanup the comment for m68k linux boot argument passing.

Richard Retanubun
2009-02-20T18:01:56Z

From 4adb975b29acdd64e7ea37f3d8ecd14d77c844b4 Mon Sep 17 00:00:00 2001
From: Richard Retanubun <RichardRetanubun@RuggedCom.com>
Date: Fri, 20 Feb 2009 11:06:36 -0500
Subject: [PATCH] Cleanup the comment for m68k linux boot argument passing.

This patch clarifies the way m68k passes linux boot argument.
The one gotcha here is that the assembly instruction that
the compiler uses to jump to the kernel is 'jsr' which pushes the
program counter for the instruction after the jsr into the stack pointer.

Signed-off-by: Richard Retanubun <RichardRetanubun@RuggedCom.com>
---
V2.1: Now with more lines :)

lib_m68k/bootm.c | 11 ++++++-----
1 files changed, 6 insertions(+), 5 deletions(-)
mode change 100644 => 100755 lib_m68k/bootm.c

diff --git a/lib_m68k/bootm.c b/lib_m68k/bootm.c
old mode 100644
new mode 100755
index 0798e07..958c5ce
--- a/lib_m68k/bootm.c
+++ b/lib_m68k/bootm.c
@@ -111,11 +111,12 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)

/*
* Linux Kernel Parameters (passing board info data):
- * r3: ptr to board info data
- * r4: initrd_start or 0 if no initrd
- * r5: initrd_end - unused if r4 is 0
- * r6: Start of command line string
- * r7: End of command line string
+ * sp+00: Ignore, side effect of using jsr to jump to kernel
+ * sp+04: ptr to board info data
+ * sp+08: initrd_start or 0 if no initrd
+ * sp+12: initrd_end - unused if initrd_start is 0
+ * sp+16: Start of command line string
+ * sp+20: End of command line string
*/
(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
/* does not return */
--
1.5.6.5