DaVinci Initrd 1.0

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Revision as of 19:34, 17 December 2007 by Prpplague (Talk | contribs)

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Create initrd Procedure (note change count to your required filesystem size):

> dd if=/dev/zero of=uRamdisk.img bs=1k count=20480
> mkfs.ext2 -F -v -M0 uRamdisk.img
> mount -o loop uRamdisk.img <path to mount point>

Now copy all the files needed for RAMDISK to the <path to mount point>.. that would be busybox and/or other apps and libs.

> umount <path to mount point>
> gzip -9 < uRamdisk.img > uRamdisk

Installing the Ramdisk (/tftpboot/uRamdisk) via u-boot

Copy the data into RAM then flash:


UBOOT# install_ramdisk 'tftp 0x2200000 uRamdisk; era 0x2200000 +${filesize};cp.b 0x85000000 0x2200000 
${filesize}'

Save the ramdisk size into an environmental variable:

UBOOT# setenv ramdisksize 0x${filesize}; saveenv

Update the boot parameters:

UBOOT# setenv bootargs 'mem=120M console=ttyS0,115200n8 ip=dhcp root=/dev/ram0 rw initrd=0x85000000,8M'
UBOOT# setenv bootcmd 'cp.b 0x2200000 0x85000000 ${ramdisksize}; bootm'