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On Fri, 10 Oct 2008 23:06:09 -0400 |
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Andrey Vul wrote: |
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> On Fri, Oct 10, 2008 at 10:33 PM, David Wei <davidwei@×××××××××××.cn> |
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> wrote: |
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> > Sorry, I forgot that file . |
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> > the .config is in the attachment this time. |
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> > Thank you . |
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> > |
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> > On Fri, 10 Oct 2008 10:05:36 -0400 |
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> > "Andrey Vul" <andrey.vul@×××××.com> wrote: |
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> > |
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> >> 2008/10/10 David Wei <davidwei@×××××××××××.cn>: |
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> >> > Hi, |
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> >> > I am trying kexec with "kernel panic reboot" cause i have to |
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> >> > manage my server remotely. the "kernel panic |
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> >> > reboot" (http://gentoo-wiki.com/TIP_Kernel_Panic_Reboot) has |
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> >> > beening working so good so far for the regular kernel |
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> >> > panic.However,sometimes when i were missed some file system |
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> >> > items,the booking process would ask me: "VFS: Unable to mount |
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> >> > root fs via NFS,trying floppy Insert root floppy and Press |
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> >> > Enter." And the system hungup there waiting for my Enter. How |
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> >> > can I remove this item from the booting process and panic |
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> >> > directly so that it can reboot? Besides,I want to keep the NFS |
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> >> > service. Thank you in advance. |
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> >> I'm guessing that this is due to the floppy being compiled into the |
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> >> emergency kernel. |
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> >> In any case, can you post your .config for the emergency kernel? |
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> >> |
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> |
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> Nothing in the .config looks suspicious. |
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> It looks like it's inevitable that kernel patching will be needed, at |
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> least, using the preprocessor to "hide" the floppy code. |
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> Try this (it comments out floppy support which happens after NFS |
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> support): comment_floppy.patch |
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> --- init/do_mounts.c 2008-04-16 22:49:44.000000000 -0400 |
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> +++ init/do_mounts2.c 2008-10-10 23:03:06.867876561 -0400 |
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> @@ -308,7 +308,8 @@ |
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> ROOT_DEV = Root_FD0; |
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> } |
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> #endif |
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> -#ifdef CONFIG_BLK_DEV_FD |
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> +/* #ifdef CONFIG_BLK_DEV_FD */ |
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> +#if 0 |
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> if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) { |
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> /* rd_doload is 2 for a dual initrd/ramload setup */ |
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> if (rd_doload==2) { |
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> |
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> cd to your /usr/src/linux-... and run patch -p0 < comment_floppy.patch |
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> It should fix the _specific_ issue. It might not fix the root cause, |
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> however. |
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> |
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> -- |
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> Andrey Vul |
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|
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Looking in do_mounts.c, the code that generates the message is: |
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#ifdef CONFIG_ROOT_NFS |
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if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) { |
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if (mount_nfs_root()) |
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return; |
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printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n"); |
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ROOT_DEV = Root_FD0; |
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} |
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#endif |
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Looking at the .config file, I see "CONFIG_ROOT_NFS=y". Since the |
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message is being printed, we know that |
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if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) |
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is true which wmeans that the |
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if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) |
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is false, i.e. the change to "#if 0" looks to be incorrect. |
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Perhaps "CONFIG_ROOT_NFS=y" in .config is the root cause. I'd suggest |
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changing the .config. |
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HTH, |
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|
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David |
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