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Richard Fish wrote: |
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|
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> Is this an initrd or initramfs (aka, cpio.gz) image? |
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> |
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> If it is initrd, you should have a /linuxrc script to initialize the |
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> system. For grub, you will need: |
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> |
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> kernel /vmlinuz root=/dev/ram0 init=/linuxrc |
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> initrd=/rootfs.gz |
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> |
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> Then your linuxrc script must *not* exit. It will probably need to |
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> call /sbin/init with something like: |
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> |
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> exec /sbin/init $@ |
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> |
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> In your case, /linuxrc probably doesn't need to do much of anything else. |
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> |
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> |
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> If it is initrams, then you just need to create a /init script and |
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> place the same "exec /sbin/init..." inside it. You do not need the |
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> init= option for the kernel in the grub configuration. |
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> |
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> For some more info, take a look at |
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> /usr/src/linux/Documentation/early-userspace/README |
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> |
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> HTH |
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> |
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> -Richard |
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> |
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> Ognjen Bezanov wrote: |
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> |
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>> Hi all, |
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>> |
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>> Im building an x86 embedded distro using gentoo. Now i have been rather |
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>> successful. I have built the whole system and it works, while only |
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>> taking up 9mb (when gzipped). |
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>> |
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>> Now my question is how to get linux to load the gzipped image file into |
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>> a ramdisk and use it as a root filesystem. |
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>> |
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>> Running the system directly from the CF card works great, but when |
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>> trying to get it to run it in ram it fails |
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>> with "kernel panic: VFS: Unable to mount root fs on unknown-block(1,0)". |
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>> |
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>> My attempt at running the system from ram is as follows: |
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>> |
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>> (grub config file): |
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>> |
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>> kernel /vmlinuz initrd=/rootfs.gz root=/dev/ram0 |
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>> |
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>> the rootfs.gz file is ~10Mb, and when uncompressed is an 100mb image |
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>> (most of the image is free space to |
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>> allow for future additions, this is a test bed). |
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>> |
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>> |
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>> Now I presume this is probably what is incorrect, in which case can |
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>> anyone help me regarding how to use |
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>> ramdisks as root devices. (googling about tells me that the initrd image |
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>> is not the root image, but rather |
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>> a pre-root mounting fs to prepare the system for booting). |
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>> |
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>> P.S Please CC me as this mailinglist doesnt play nice with my email |
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>> account. thanks! |
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>> |
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>> |
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>> |
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> |
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Thanks, that was helpful. Now the system finds the root fs and loads it. |
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But the system still wont boot. It tells me "RAMDISK: Compressed image |
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found at block 0" as a final kernel message, then just sits there (for |
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ages). At lease its closer to functioning then before, but there are a |
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few bugs to iron out. |
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|
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What could be wrong? |
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|
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Thanks in advance |
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|
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-- |
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