DaVinci Initrd 1.0

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Revision as of 00:44, 20 June 2007 by SpaceMonkey (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:

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

Save the ramdisk size into an environmental variable:

# setenv ramdisksize 0x${filesize}; saveenv

Update the boot parameters:

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