Boot from USB using u-boot

Note: This instruction apply and booting only to TV with firmwares listed below!

T-CHE7AUSC, T-CHEAUSC, T-CHL5DAUC, T-CHL5DEUC, T-CHL7DAUC, T-CHL7DEUC, T-CHU7DAUC, T-CHU7DEUC

T-CHE6AUSC not supported currently, needed T-CHL5DAUC, T-CHL5DEUC firmware tv testers.

This is for advanced users and developers only.

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Requirements:

• Serial connection
• Usb disk drive or pen drive (at least 256MB)
• TFTP server outside TV on some host in case using pen drive or optionaly in case disk drive
• Regular Linux based system to prepare usb disk/pen drive
• Builded rootfs image

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Follow steps:

• Build rootfs image using SamyGO OE Framework.

Builded rootfs image is located in build-samygo/tmp/deploy/images directory. File name looks like externalboot-base-rootfs-ssdtv-xxxxxxx.tar.gz.

• Partition usb disk/pen drive.

Partition drive using fdisk or other tool.

First parittion FAT type. It will be usefull or needed if you don't have network on tv. Second partition as Linux type.

Format first partition with mtools or other tool as VFAT type filesystem. Format second partition with ext2fsprogs as ext3.

• Unpack rootfs image to linux partition on usb disk/pen drive.

Unpack image to second partition with root rights.

• Put kernel image to TFTP service directory.

Note: Do this only if you want faster kernel load image.

Unpack uImage-2.6.18-r0-ssdtv.bin from /boot in image rootfs, raname it to uImage and copy to root directory of TFTP service.

• Enable serial debug console.

• Enter u-boot prompt shell.

• Set variables and execute commands in u-boot shell to boot linux kernel.

In case use TFTP set network variables first:

setenv ipaddr 192.168.1.100;setenv gatewayip 192.168.1.1;setenv serverip 192.168.1.2

where first IP is TV, second gateway is not important in this case, third is address of TFTP server.

Boot linux kernel (case TFTP):

setenv bootargs root=/dev/sda2 console=ttyS1;tftp;bootm

Boot linux kernel (case USB FAT partition):

setenv bootargs root=/dev/sda2 console=ttyS1;usb start;fatload usb 0 61000000 uImage;bootm

where /dev/sda2 is linux rootfs.

• Install Samsung original software:

samsung-install.sh

• Start Samsung original software:

After boot system, login over serial console as root and execute followed command:

samsung-start.sh