hardcode root= kernel option

May 25, 2009 2 Replies

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dmg2009 17 years ago

Hi,

Is it possible to compile the linux 2.6 kernel with "root=root=/dev/ mtdblock2 ro" option?

I've put the linux to the embedded device. It use RedBoot bootloader to load the kernel and I can't change command line parameters that are provided to the kernel.

Params command line provided by bootloader is: console=ttyS0,38400 What I need is: console=ttyS0,38400 root=/dev/mtdblock2 ro

Here is a bootlog:

+Ethernet eth0: MAC address 00:50:fc:02:03:04 IP: 192.168.12.142

RedBoot(tm) bootstrap and debug environment [ROM] Non-certified release, version v2_0 - built 16:13:31, Jun 28 2007

RAM: 0x00000000-0x000f0000, 0x000705f0-0x000a0000 available

Flash ID=22a8,flash_base=0xffc00000 linux -b 0x400000 -l 0x000bba34 -s 0x000bba30 -c "console=ttyS0,38400" == Executing boot script in 1.000 seconds - enter ^C to abort

Thanks, Dawid

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zix 17 years ago

first of all, i dont know why u cant edit your boot params, cause thats highly possible. Anyways, considering if u cannot change that...u can change your rootfile system if you build your ramfs by (dd if=/dev/mtdblock2 of=/dev/zero bs= count=)/dev/ mtdblock2 instead of conventional /dev/ram0 and then proceed in normal way. I think thats possibloe, but I personally havent tried it.

but truly speaking, i think you shou;d take a hard look why as to ur boot params cannot be changed before chaging here, cause i guess you will have the need to change it later at some point of time.

~zix

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Kristof Provost 17 years ago

Yes, look for 'CONFIG_CMDLINE' in the configuration file, or under 'Boot options' after make menuconfig.

Kristof

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