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On Wed, Apr 30, 2008 at 08:43:53AM +0200, Raffaele BELARDI wrote: |
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> In the process of building an amd64 diskless box, I am trying to make a |
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> bootable USB key with no success up to now. |
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> |
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> The kernel starts to load, but panics because it is unable to find the |
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> root partition. When it stops it shows the available partitions, these |
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> include all the hard disk partitions but no USB key partition. In fact, |
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> if I omit the 'root' parameter from the grub shell the boot works fine |
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> but it uses the hard disk root partition instead of the USB one. |
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> |
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> >From the log on the screen the USB controller seems correctly detected, |
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> so I don't understand why it is not finding the root. While writing this |
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> one idea comes to my mind, maybe it is failing because I attach the key |
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> to a SDC/MMC/USB card reader? This evening I'll try to plug it into a |
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> different USB slot. |
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> |
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Try adding the rootdelay=N kernel option. When I was running a laptop from a USB device, rootdelay=12 was the minimum that would always work. It takes a while to detect all the available USB devices, and rootdelay makes the kernel wait N seconds before trying to mount the given root device. |
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(Also, be sure you have usb_storage, etc compiled in.) |
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