Dear "mike xu",
In message <7103aeea0812181017j19966d84y22528f8728d5...@mail.gmail.com> you
wrote:
>
> Do you know that what u-boot shall do after passing 'root=/dev/ram0'
> to kernel? How kernel locates /dev/ram0?
U-Boot starts the Linux kernel.
How the Linux kernel receives it's parameters is more a Linux
specific question - so far, MIPS failed to com up with a standard
solution for this problem (at least I don't know one).
You might even go ahead and make yourselkf a name in the community by
implementing device tree awarenes for MIPS ;-)
> I want to use one ramdisk as my rootfs, but the kernel failed to mount
> the ramdisk, I set the u-boot parameter as below.
> setenv bootargs console=ttyS0,115200 root=/dev/ram0 ro mem=128M
>
> kernel reports errors:
> No filesystem could mount root, tried: ext2 cramfs squashfs romfs
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(1,0)
See previous message.
> root=/dev/ram1 also failed... What's the difference between /dev/ram0
> and /dev/ram1?
It's the same as between /dev/sda and /dev/sdb - they are differend
devices.
> And are there any requirement for the ramdisk image? Such as
> little/big endian, block size?
Yes, of course there are such requirements - they have to match what
your kernel expects.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
A woman should have compassion.
-- Kirk, "Catspaw", stardate 3018.2
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