[uClinux-dev] finding the root device

Greg Ungerer gerg at snapgear.com
Fri Sep 21 02:18:02 EDT 2012


Hi Richard,

On 20/09/12 20:38, Richard Cochran wrote:
> I am running mainline Linux on the Freescale/Axiom M5234BCC with uboot
> 2011.09-01111-g0562219 and have been carrying along a patch from the
> uClinux-dist, like shown below for v3.2.9.
>
> I create a image by concatenating the kernel with a romfs, and I boot
> it by loading over tftp and jumping to the image with the uboot 'go'
> command.
>
> My question: Is there a way to pass the kernel command line from uboot
> to specify the root device, instead of using this patch?

I haven't used uboot on ColdFire, so I am not sure if there is a
standard way to pass kernel parameters.

But you can always build command line options into your kernel config.
Look in the "Kernel Hacking" -> "Compiled-in Kernel Boot Parameter".
I always do this with stock kernels, setting the command line to
"root=/dev/mtdblock0" in the config.

Regards
Greg



>
> diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c
> index 6793074..9cf7df5 100644
> --- a/drivers/mtd/maps/uclinux.c
> +++ b/drivers/mtd/maps/uclinux.c
> @@ -15,6 +15,7 @@
>   #include <linux/fs.h>
>   #include <linux/mm.h>
>   #include <linux/major.h>
> +#include <linux/root_dev.h>
>   #include <linux/mtd/mtd.h>
>   #include <linux/mtd/map.h>
>   #include <linux/mtd/partitions.h>
> @@ -89,6 +90,7 @@ static int __init uclinux_mtd_init(void)
>   	mtd->priv = mapp;
>
>   	uclinux_ram_mtdinfo = mtd;
> +	ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0);
>   	mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
>
>   	return(0);
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>


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Greg Ungerer  --  Principal Engineer        EMAIL:     gerg at snapgear.com
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