Boot from USB using u-boot

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

T-CHL5DEUC, T-CHL5DAUC, T-CHE6AUSC, T-CHE7AUSC, T-CHEAUSC, T-CHL7DAUC, T-CHL7DEUC, T-CHU7DAUC, T-CHU7DEUC

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 if you prefer load kernel from network.
• Regular Linux based system to prepare usb disk/pen drive (disk drive is preffered for speed)
• Builded rootfs image and kernel.

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Follow steps:

Build OE kernel and rootfs or download prebuilded binaries

• Prebuilded binaries you can find from here: externalboot-base-rootfs-ssdtv-XXXXXXX.tar.gz, uImage-2.6.18.8-r0-ssdtv.multi-config-multi-config-bXXXX.bin.

Or you can build your self from recent repository:

• 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.

Prepare USB disk

• Partition usb disk/pen drive.

Partition drive using fdisk or other tool.

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

• Follow two steps below only if you want install original samsung software (script can also download image from inside booted tv, but it's preffered download and copy into rootfs):

• Download original firmware file from samsung site (e.g T-CHL7DEUC.exe for B65x-B75x) and place as is on /home/root

• Download LaunchCLManager.zip and place as is on /home/root

TFTP server for kernel load

• Put kernel image to TFTP service directory. (like /tftpboot directory, or for NAS it is on /opt/tftpboot)

Note: Do this only if you want faster kernel load or lack network.

• Find proper kernel image in build-samygo/tmp/deploy/images or download from http://download.samygo.tv/SamyGO%20Open%20Embedded/binaries/ .

It's like: uImage-2.6.18.8-r0-ssdtv.multi-config-multi-config-bXXXX.bin.

For firmwares:

T-CHE7AUSC, T-CHEAUSC, T-CHL7DAUC, T-CHL7DEUC, T-CHU7DAUC, T-CHU7DEUC - use b650

T-CHE6AUSC - use b6000

T-CHL5DEUC, T-CHL5DAUC - use b550

• Copy and rename it to uImage into root directory of TFTP service or on FAT partition if you are not using TFTP way.

• Enable serial debug console.

• Enter u-boot prompt shell.

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

Booting TV

You can load and boot kernel from USB or TFTP:

TFTP

Set network variables first:

setenv ipaddr 192.168.1.100;setenv gatewayip 192.168.1.1;setenv serverip 192.168.1.200

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

Boot linux kernel over TFTP and rootfs from USB ext3 partition:

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

USB

Boot linux kernel from USB FAT partition, rootfs from USB ext3 partition:

setenv bootargs root=/dev/sda2 rootdelay=1 console=ttyS1;usb start;fatload usb 0 61000000 uImage;bootm

where /dev/sda2 is linux rootfs.

Starting main Samsung TV software

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

• Install Samsung original software:

samsung-install.sh

Choose your firmware version:

root@localhost:~# samsung-install.sh

--- Installer of Original Samsung Software ---
--- SamyGO http://www.samygo.tv ---


Select proper firmware for your TV:

1. T-CHE6AUSC
2. T-CHE7AUSC
3. T-CHEAUSC
4. T-CHL5DAUC
5. T-CHL5DEUC
6. T-CHL7DAUC
7. T-CHL7DEUC
8. T-CHU7DAUC
9. T-CHU7DEUC

Choice:

Wait while TV installs firmware. It is quite long process, be patient.

• Start Samsung original software:

samsung-start.sh

Done!

NB! Kernel from OE does not support NAND writing and it does not help to restore bricked device.