Letux 400 Hardware

Operation

Table of Content

boot modifier and special notes for the operation

Boot Modifier Keys

To boot from SD card, the Letux 400 U-Boot checks that Fn + Left-Shift are pressed on power up.

After Initial Boot

The kernel recognizes additional modifiers to switch the root file system. These are different from the combination used by U-Boot and are interpreted by a routine provided in the kernel.

You can press these additional keys right before pressing the power button but must hold them at least 5 seconds. They are not checked immediately after power on when the penguin appears but with more delay.

If you see the "INIT: version 2.86 booting" message on the screen, you can release the buttons. Here are the modifier keys:

  • F1: boot from first SD partition (/dev/mmcblk0p1, ext3)
  • F2: boot from second SD partition (/dev/mmcblk0p2, ext3)
  • F3: boot minifs from internal partition (/dev/mtdblock3, jffs2)
  • F4: boot from internal partition (/dev/mtdblock4, yaffs2)
  • Fn: boot from second SD partition (/dev/mmcblk0p2, ext3) (kernel was booted from SD on Fn+Ctrl+LeftShift)
  • none: boot from internal partition (/dev/mtdblock4, yaffs2)

WARNING: Don't press Fn + Left-Shift + Ctrl to boot! This will copy the 2.6 kernel into the NAND flash and afterwards, you can't boot from NAND to the original system. To recover from such a mistake, please refer to http://download.goldelico.com/letux-400-jtag/

Resources

Created: 1 year 8 months ago
by Nikolaus Schaller

Updated: 1 year 8 months ago
by Paul Boddie

Old Revisions