finding the root device

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?

Thanks,
Richard


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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