Messages in this thread | | | Date | Mon, 13 Feb 2012 10:48:30 -0800 | From | "H. Peter Anvin" <> | Subject | Re: No /dev/root with devtmpfs? |
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On 02/13/2012 12:25 AM, Kirill Smelkov wrote: >> >> The bootloader might pass the root partition to the kernel via the >> "root=" kernel parameter; these can be read at /proc/cmdline. >> For example, on an HP iPAQ hx4700: root=/dev/mtdblock2 > > This does not work universally either, for example for > > root=PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF > > > the kernel scans partitions and finds one for root by partition uuid > (see name_to_dev_t() in init/do_mounts.c). > > That's exactly my situation - I have universal flash image which can > bee booted via CF slot (on several boards, thus will have different > /dev/hd? or /dev/sd?) and via usb/cardreader (again different /dev/ > entry), and root is mounted by partition id. > > The kernel has no problem finding root partition and mounting it. I just > needed a sane and robust way to know its choice. >
In this case it's not the kernel, but the initramfs which does this lookup. In that case the initramfs could/should create /dev/root.
-hpa
-- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.
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