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Cleanup the comment for m68k linux boot argument passing.

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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>
Signed-off-by: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Richard Retanubun 2009-02-20 13:01:56 -05:00 • committed by Wolfgang Denk
parent 4d41650eec
commit edff7bcc4d
1 changed files with 6 additions and 5 deletions
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11
lib_m68k/bootm.c Normal file → Executable file
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@ -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): * Linux Kernel Parameters (passing board info data):
* r3: ptr to board info data * sp+00: Ignore, side effect of using jsr to jump to kernel
* r4: initrd_start or 0 if no initrd * sp+04: ptr to board info data
* r5: initrd_end - unused if r4 is 0 * sp+08: initrd_start or 0 if no initrd
* r6: Start of command line string * sp+12: initrd_end - unused if initrd_start is 0
* r7: End of command line string * sp+16: Start of command line string
* sp+20: End of command line string
*/ */
(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end); (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
/* does not return */ /* does not return */