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| author | Michal Simek <monstr@monstr.eu> | 2012-08-16 15:53:35 +0200 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2012-10-04 14:59:19 +0200 |
| commit | fcc1c0ff2506cab8c3a019374550f68b3cbadcbe (patch) | |
| tree | 5e78312ddff66318a7cd38fcaa92e48b7baaf5da /arch/microblaze/kernel/head.S | |
| parent | c7e9a211e22782af5857d265a83abf55619f19ea (diff) | |
| download | op-kernel-dev-fcc1c0ff2506cab8c3a019374550f68b3cbadcbe.zip op-kernel-dev-fcc1c0ff2506cab8c3a019374550f68b3cbadcbe.tar.gz | |
microblaze: Fix bug with passing command line
When u-boot passes control over to Linux it places the Linux command
line between to the end of __init_end. When space between
__init_end and __bss_start is not COMMAND_LINE_SIZE then
the part of cmdline can be lost.
In extreme case if __init_end == __bss_start u-boot can't pass
any cmdline to Linux kernel.
This patch fix this issue by copying cmd line directly to
cmd_line char array which is placed in data section.
Reported-by: David Mc Andrew <david.mcandrew@xilinx.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/kernel/head.S')
| -rw-r--r-- | arch/microblaze/kernel/head.S | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/microblaze/kernel/head.S b/arch/microblaze/kernel/head.S index 98b17f9..eef84de 100644 --- a/arch/microblaze/kernel/head.S +++ b/arch/microblaze/kernel/head.S @@ -109,20 +109,24 @@ no_fdt_arg: #ifndef CONFIG_CMDLINE_BOOL /* * handling command line - * copy command line to __init_end. There is space for storing command line. + * copy command line directly to cmd_line placed in data section. */ + beqid r5, skip /* Skip if NULL pointer */ or r6, r0, r0 /* incremment */ - ori r4, r0, __init_end /* load address of command line */ + ori r4, r0, cmd_line /* load address of command line */ tophys(r4,r4) /* convert to phys address */ ori r3, r0, COMMAND_LINE_SIZE - 1 /* number of loops */ _copy_command_line: - lbu r2, r5, r6 /* r2=r5+r6 - r5 contain pointer to command line */ - sb r2, r4, r6 /* addr[r4+r6]= r2*/ + /* r2=r5+r6 - r5 contain pointer to command line */ + lbu r2, r5, r6 + beqid r2, skip /* Skip if no data */ + sb r2, r4, r6 /* addr[r4+r6]= r2*/ addik r6, r6, 1 /* increment counting */ bgtid r3, _copy_command_line /* loop for all entries */ - addik r3, r3, -1 /* descrement loop */ + addik r3, r3, -1 /* decrement loop */ addik r5, r4, 0 /* add new space for command line */ tovirt(r5,r5) +skip: #endif /* CONFIG_CMDLINE_BOOL */ #ifdef NOT_COMPILE |
