mirror of
https://github.com/vincentmli/bpfire.git
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c98e55d8f8
git-svn-id: http://svn.ipfire.org/svn/ipfire/trunk@289 ea5c0bd1-69bd-2848-81d8-4f18e57aeed8
144 lines
6.4 KiB
Diff
144 lines
6.4 KiB
Diff
diff -ur grub-0.93~/docs/grub.texi grub-0.93/docs/grub.texi
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--- grub-0.93~/docs/grub.texi 2003-02-06 12:30:12.000000000 +0100
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+++ grub-0.93/docs/grub.texi 2003-02-06 14:15:30.000000000 +0100
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@@ -2632,7 +2632,7 @@
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@node install
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@subsection install
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-@deffn Command install [@option{--force-lba}] [@option{--stage2=os_stage2_file}] stage1_file [@option{d}] dest_dev stage2_file [addr] [@option{p}] [config_file] [real_config_file]
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+@deffn Command install [@option{--force-lba[=off]}] [@option{--stage2=os_stage2_file}] stage1_file [@option{d}] dest_dev stage2_file [addr] [@option{p}] [config_file] [real_config_file]
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This command is fairly complex, and you should not use this command
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unless you are familiar with GRUB. Use @command{setup} (@pxref{setup})
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instead.
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@@ -2679,6 +2679,13 @@
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bitmap even if they do have the support. So GRUB provides a solution to
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ignore the wrong bitmap, that is, the option @option{--force-lba}. Don't
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use this option if you know that your BIOS doesn't have LBA support.
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+On the other hand there is at least one known BIOS that does the opposite,
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+it claims to support LBA and then fails to provide it. Iff you have an
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+Adaptec 2940 with BIOS revision 1.21 ( newer ones just work and older ones
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+don't make the false claim ), or otherwise experience grub hanging
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+after stage1, you can try to use the option @option{--force-lba=off},
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+as long as all disk blocks involved in booting reside
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+within the first 1024 cylinders.
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@strong{Caution3:} You must specify the option @option{--stage2} in the
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grub shell, if you cannot unmount the filesystem where your stage2 file
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diff -ur grub-0.93~/stage1/stage1.S grub-0.93/stage1/stage1.S
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--- grub-0.93~/stage1/stage1.S 2002-09-08 03:58:08.000000000 +0200
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+++ grub-0.93/stage1/stage1.S 2003-02-06 13:19:50.000000000 +0100
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@@ -163,7 +163,11 @@
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/* check if AH=0x42 is supported if FORCE_LBA is zero */
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MOV_MEM_TO_AL(ABS(force_lba)) /* movb ABS(force_lba), %al */
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testb %al, %al
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+ /* check if LBA is forced OFF 0x80 <= %al <= 0xff */
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+ js chs_mode
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+ /* or forced ON 0x01 <= %al <= 0x7f */
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jnz lba_mode
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+ /* otherwise trust BIOS int's result */
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andw $1, %cx
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jz chs_mode
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diff -ur grub-0.93~/stage2/asm.S grub-0.93/stage2/asm.S
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--- grub-0.93~/stage2/asm.S 2003-02-06 12:30:12.000000000 +0100
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+++ grub-0.93/stage2/asm.S 2003-02-06 13:35:32.000000000 +0100
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@@ -1083,7 +1083,11 @@
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/* check if AH=0x42 is supported if FORCE_LBA is zero */
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movb EXT_C(force_lba), %al
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testb %al, %al
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+ /* check if LBA is forced OFF 0x80 <= %al <= 0xff */
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+ js 1f
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+ /* or forced ON 0x01 <= %al <= 0x7f */
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jnz 2f
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+ /* otherwise trust BIOS int's result */
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andw $1, %cx
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jnz 2f
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diff -ur grub-0.93~/stage2/builtins.c grub-0.93/stage2/builtins.c
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--- grub-0.93~/stage2/builtins.c 2003-02-06 12:30:12.000000000 +0100
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+++ grub-0.93/stage2/builtins.c 2003-02-06 13:56:01.000000000 +0100
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@@ -1832,7 +1832,12 @@
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/* First, check the GNU-style long option. */
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while (1)
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{
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- if (grub_memcmp ("--force-lba", arg, sizeof ("--force-lba") - 1) == 0)
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+ if (grub_memcmp ("--force-lba=off", arg, sizeof ("--force-lba=off") - 1) == 0)
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+ {
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+ is_force_lba = 0xff;
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+ arg = skip_to (0, arg);
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+ }
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+ else if (grub_memcmp ("--force-lba", arg, sizeof ("--force-lba") - 1) == 0)
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{
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is_force_lba = 1;
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arg = skip_to (0, arg);
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@@ -2253,7 +2258,7 @@
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"install",
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install_func,
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BUILTIN_CMDLINE,
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- "install [--stage2=STAGE2_FILE] [--force-lba] STAGE1 [d] DEVICE STAGE2 [ADDR] [p] [CONFIG_FILE] [REAL_CONFIG_FILE]",
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+ "install [--stage2=STAGE2_FILE] [--force-lba[=off]] STAGE1 [d] DEVICE STAGE2 [ADDR] [p] [CONFIG_FILE] [REAL_CONFIG_FILE]",
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"Install STAGE1 on DEVICE, and install a blocklist for loading STAGE2"
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" as a Stage 2. If the option `d' is present, the Stage 1 will always"
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" look for the disk where STAGE2 was installed, rather than using"
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@@ -2266,8 +2271,9 @@
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" 1.5 and REAL_CONFIG_FILE is present, then the Stage 2 CONFIG_FILE is"
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" patched with the configuration filename REAL_CONFIG_FILE."
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" If the option `--force-lba' is specified, disable some sanity checks"
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- " for LBA mode. If the option `--stage2' is specified, rewrite the Stage"
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- " 2 via your OS's filesystem instead of the raw device."
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+ " for LBA mode, `--force-lba=off' will disable it completely. If the"
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+ " option `--stage2' is specified, rewrite the Stage 2 via your OS's"
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+ " filesystem instead of the raw device."
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};
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@@ -3898,7 +3904,12 @@
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/* Check if the user specifies --force-lba. */
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while (1)
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{
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- if (grub_memcmp ("--force-lba", arg, sizeof ("--force-lba") - 1) == 0)
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+ if (grub_memcmp ("--force-lba=off", arg, sizeof ("--force-lba=off") - 1) == 0)
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+ {
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+ is_force_lba = 0xff;
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+ arg = skip_to (0, arg);
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+ }
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+ else if (grub_memcmp ("--force-lba", arg, sizeof ("--force-lba") - 1) == 0)
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{
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is_force_lba = 1;
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arg = skip_to (0, arg);
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@@ -4026,7 +4037,9 @@
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#if 1
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/* Don't embed a drive number unnecessarily. */
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grub_sprintf (cmd_arg, "%s%s%s%s %s%s %s p %s %s",
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- is_force_lba? "--force-lba " : "",
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+ is_force_lba ?
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+ (is_force_lba == 0xff ? "--force-lba=off " : "--force-lba ")
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+ : "",
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stage2_arg? stage2_arg : "",
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stage2_arg? " " : "",
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stage1,
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@@ -4079,17 +4092,18 @@
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"setup",
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setup_func,
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BUILTIN_CMDLINE | BUILTIN_HELP_LIST,
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- "setup [--prefix=DIR] [--stage2=STAGE2_FILE] [--force-lba] INSTALL_DEVICE [IMAGE_DEVICE]",
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+ "setup [--prefix=DIR] [--stage2=STAGE2_FILE] [--force-lba[=off]] INSTALL_DEVICE [IMAGE_DEVICE]",
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"Set up the installation of GRUB automatically. This command uses"
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" the more flexible command \"install\" in the backend and installs"
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" GRUB into the device INSTALL_DEVICE. If IMAGE_DEVICE is specified,"
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" then find the GRUB images in the device IMAGE_DEVICE, otherwise"
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" use the current \"root device\", which can be set by the command"
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" \"root\". If you know that your BIOS should support LBA but GRUB"
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- " doesn't work in LBA mode, specify the option `--force-lba'."
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- " If you install GRUB under the grub shell and you cannot unmount the"
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- " partition where GRUB images reside, specify the option `--stage2'"
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- " to tell GRUB the file name under your OS."
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+ " doesn't work in LBA mode, specify the option `--force-lba'. If the"
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+ " BIOS claims to support LBA mode but really doesn't, use"
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+ " `--force-lba=off'. If you install GRUB under the grub shell and"
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+ " you cannot unmount the partition where GRUB images reside, specify"
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+ " the option `--stage2' to tell GRUB the file name under your OS."
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};
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