Copy the gzipped SD-Card image to the rootfs of the SD-Card:

gzip sd.hdimg
cp sd.hdimg.gz $SD_MOUNT

On the target:

dd if=sd.hdimg | gunzip | dd of=/dev/mmcblk1

Alternative: copy the running image from SD-Card to the MMC:

dd if=/dev/mmcblk0 of=/dev/mmcblk1 bs=1M count=400

Change the DIP-Switches to boot from eMMC.

Hit any key to stop autoboot:  0
U-Boot# mmc dev 1
mmc1(part 0) is current device
U-Boot# set bootpart 1:1
U-Boot# run loaduimage
reading /uImage
3102000 bytes read in 351 ms (8.4 MiB/s)
U-Boot# run mmcboot
Booting from mmc ...

Boot-Order: eMMC, SD

Boot-Order: SD, SPI-NOR

Boot-Order: SPI-NOR, eMMC

to configure the TI Kernel use the following command

ptxdist menuconfig kernel-ti

1. Customise kernel respectively devicetree
2. ptxdist drop kernel-ti compile
3. ptxdist drop u-boot install
4. ptxdist images –git

There are two RTC's on the TQMa335x:

• rtc0 = RTC Sitara AM335x
• rtc1 = RTC Module PMIC

hwclock -w hwclock -f /dev/rtc0 -w

hwclock -f /dev/rtc0 --show

hwclock -w hwclock -f /dev/rtc1 -w

hwclock -f /dev/rtc1 --show

Devicetree can be edit with the fdt commands under U-Boot.

1) At first the fdt file has to be loaded from the current boot medium (mmc) into RAM.

U-Boot# run loadfdt

2) Next step is to set the predefined U-Boot environment variable fdtaddr through the fdt addr command.

U-Boot# fdt addr $fdtaddr

3) Afterwards the size of the fdt has to be increased (to the next 4K divider) in order to have some space for modifications. This is simply done by entering:

U-Boot# fdt resize 

4) List device in the tree you want to change to have a look at the default settings.

Example

U-Boot# fdt list /leds
leds {
        compatible = "gpio-leds";
        lvds_shtdn {
        };
        backlight {
        };
};
U-Boot# fdt print /leds
leds {
        compatible = "gpio-leds";
        lvds_shtdn {
                gpios = <0x0000003a 0x00000003 0x00000002>;
                default-state = "on";
        };
        backlight {
                gpios = <0x0000003a 0x00000004 0x00000002>;
                default-state = "on";
        };
};

5) To modify a value of a propertie use the fdt set command.

U-Boot# fdt set <path> <property> <value> 

Example

U-Boot# fdt set /leds/backlight default-state off 

6) Optional: If you want to save your modified Devicetree back to mmc you'll have to run the following command:

U-Boot# fatwrite mmc $bootpart $fdtaddr $fdtfile <totalsize> 

You can find out <totalsize> of the modified fdt by entering the command fdt header

Otherwise you can boot your module with the changed Devicetree right after the modification.