[U-Boot] no mtdparted from U-Boot> prompt

[johns at msli.com]

This is my first post to the list.
I am using u-boot-1.3.4 in buildroot-2011.11
My device is a at91sam9g20-ek
I have a patch adding: include/configs/at91sam9g20ek.h
which I gather acts as a config file for u-boot.

U-Boot> help
does not list mtdparts

But my bootargs does use it:
bootargs=mem=64M console=ttyS0,115200 mtdparts=atmel_nand:4M(bootstrap/uboot/kernel)ro,60M(rootfs),-(data) root=/dev/mtdblock1 rw rootfstype=jffs2

Is there a trick to add the mtdparts command?
Or is there supposed to be a command?

I unsuccessfully added to include/configs/at91sam9g20ek.h
#define CONFIG_JFFS2_NAND 1
#define CONFIG_JFFS2_CMDLINE 1
#define CONFIG_CMD_JFFS2 1 // Required to include cmd_jffs2.c
which did not result in adding the command line.




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