Hi,
I believe I have found a nasty bug in my target's linker script. And since all MIPS targets use copies of more-or-less the same linker script, I think all MIPS targets suffer from this bug.
It's alignment dependent whether the bug will cause a problem or not. The symptoms can vary from hang-ups in find_cmd for any command to a hang-up if the first command in the command table is used (usually bdinfo).
The cause of this problem is the 'Update GOT' part in the function relocate in cpu/mips/start.S. Depending on alignment, this update part will update a number of entries too many, corrupting whatever is next in memory: The command table.
The cause of the problem is a misalignment between the _gp linker variable and the actual '.'. This is what's in board/mipstarget/u-boot.lds now:
. = ALIGN(4); .sdata : { *(.sdata) }
_gp = ALIGN(16);
__got_start = .; .got : { *(.got) } __got_end = .;
.sdata : { *(.sdata) }
__u_boot_cmd_start = .;
And this is what it's supposed to be: . = ALIGN(4); .sdata : { *(.sdata) }
. = ALIGN(16); _gp = .;
__got_start = .; .got : { *(.got) } __got_end = .;
.sdata : { *(.sdata) }
__u_boot_cmd_start = .;
Who can give me any comments?
With kind regards,
Robert.