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Factory-configured DreamPlugs need their internal u-boot firmware updated and
re-configured to boot from the SD card.
You may want to remove the internal microSD card for the sake of simplicity.
This will result in u-boot and linux boot warnings, but these can be ignored.
The desired u-boot configuration is:
baudrate=115200
bootargs=console=ttyS0,115200 root=/dev/sdb2 rootdelay=10
bootcmd=${x_bootcmd_usb}; ${x_bootcmd_kernel}; ${x_bootcmd_initrd}; setenv bootargs ${x_bootargs} ${x_bootargs_root}; bootm 0x6400000 0x6900000;
x_bootargs=console=ttyS0,115200
x_bootargs_root=root=/dev/sdb2 rootdelay=10
x_bootcmd_initrd=fatload usb 1:1 0x6900000 uInitrd
x_bootcmd_kernel=fatload usb 1:1 0x6400000 uImage
x_bootcmd_usb=usb start
HOWTO: flash and configure u-boot
-----------------------------------
The default SD card images include the u-boot firmware required to boot from
the card. Insert a flashed SD card into the DreamPlug and connect with screen:
$ screen /dev/ttyUSB0 115200
Power up the DreamPlug and quickly press enter in the screen session to
interrupt boot. Then enter the following commands into the running u-boot
session (change the last argument of the 'sf write' line, in hex, if the .kwb
file size changes from exactly 196076 bytes):
usb start
fatload usb 1 0x6400000 uboot.2012.04.01-2_armel.kwb
sf probe 0
sf erase 0x0 0x80000
sf write 0x6400000 0x0 0x2fdec
setenv baudrate 115200
setenv bootcmd '${x_bootcmd_usb}; ${x_bootcmd_kernel}; ${x_bootcmd_initrd}; setenv bootargs ${x_bootargs} ${x_bootargs_root} ${x_bootargs_console}; bootm 0x6400000 0x6900000;'
setenv x_bootargs_console 'ttyS0,115200'
setenv x_bootargs_root 'root=/dev/sdb2 rootdelay=10'
setenv x_bootcmd_initrd 'fatload usb 1:1 0x6900000 uInitrd'
setenv x_bootcmd_kernel 'fatload usb 1:1 0x6400000 uImage'
setenv x_bootcmd_usb 'usb start'
saveenv
reset
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