2010-07-07 11:12:45 +00:00
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From: Olaf Hering <olh@suse.de>
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Subject: new prom=nodisplay option to avoid crash in firmware on B50
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Patch-mainline: not yet
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add prom=nodisplay
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avoid crash in firmware on IBM B50 when OF stdout is on serial.
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0 > boot scsi/sd@4:1,yaboot |
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yaboot starting: loaded at 00200000 00222530 (0/0/00c1a078; sp: 00efffd0)
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brokenfirmware did not claim executable memory, fixed it myself
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Config file 'yaboot.cnf' read, 213 bytes
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Welcome to yaboot version 10.1.22-r945.SuSE
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booted from '/pci@80000000/scsi@10/sd@4:1,yaboot'
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Enter "help" to get some basic usage information
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boot:
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* linux
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boot: linux 3
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Please wait, loading kernel...
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Allocated 00600000 bytes for executable @ 02000000
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Elf32 kernel loaded...
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Loading ramdisk...
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ramdisk loaded 0030e057 @ 04100000
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OF stdout device is: /pci@80000000/isa@b/serial@i3f8
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command line: root=/dev/system/root xmon=on sysrq=1 quiet panic=12 3
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memory layout at init:
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memory_limit : 00000000 (16 MB aligned)
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alloc_bottom : 0440f000
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alloc_top : 30000000
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alloc_top_hi : 40000000
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rmo_top : 30000000
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ram_top : 40000000
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Looking for displays
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found display : /pci@80000000/display@16, opening ...
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Unexpected Firmware Error:
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DEFAULT CATCH!, code=fff00300 at %SRR0: 00c18ccc %SRR1: 00003030
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ok
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0 > reset-all
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---
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arch/powerpc/kernel/prom_init.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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--- a/arch/powerpc/kernel/prom_init.c
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+++ b/arch/powerpc/kernel/prom_init.c
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@@ -169,6 +169,7 @@ static unsigned long __initdata dt_strin
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static unsigned long __initdata prom_initrd_start, prom_initrd_end;
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+static int __initdata prom_no_display;
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#ifdef CONFIG_PPC64
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static int __initdata prom_iommu_force_on;
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static int __initdata prom_iommu_off;
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2011-04-19 20:09:59 +00:00
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@@ -596,6 +597,14 @@ static void __init early_cmdline_parse(v
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2010-07-07 11:12:45 +00:00
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#endif /* CONFIG_CMDLINE */
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prom_printf("command line: %s\n", RELOC(prom_cmd_line));
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+ opt = strstr(RELOC(prom_cmd_line), RELOC("prom="));
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+ if (opt) {
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+ opt += 5;
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+ while (*opt && *opt == ' ')
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+ opt++;
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+ if (!strncmp(opt, RELOC("nodisplay"), 9))
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+ RELOC(prom_no_display) = 1;
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+ }
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#ifdef CONFIG_PPC64
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opt = strstr(RELOC(prom_cmd_line), RELOC("iommu="));
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if (opt) {
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2011-04-19 20:09:59 +00:00
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@@ -2570,6 +2579,7 @@ unsigned long __init prom_init(unsigned
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2010-07-07 11:12:45 +00:00
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/*
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* Initialize display devices
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*/
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+ if (RELOC(prom_no_display) == 0)
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prom_check_displays();
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#ifdef CONFIG_PPC64
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