COM iMX6 Bootloader U-Boot

Enter Bootloader Console

1. Connect DHCOM UART1 (FF UART) via null modem cable to the RS232 Port of your PC
2. Start terminal program (e.g. Tera Term) on the Host PC with the following settings:

   Baud rate: 115200

   Data: 8 bit

   Parity: none

   Stop bits: 1 bit

   Flow control: none

3. Press "del" on the Host PC during Core Module system start to enter bootloader console

U-boot console commands

SPI Flash

SPI Flash Init

sf probe

Example: sf probe

Description: Initializes the OnBoard SPI Flash

SPI Flash Read

sf read <SDRAM address> <SPI Flash address> <Bytes>

Example: sf read 10000000 0 100

Description: Copies 256Bytes from SPI Flash address 0x0 to SDRAM address 0x1000_0000

SPI Flash Write

sf write <SDRAM address> <SPI Flash address> <Bytes>

Example: sf write 10000000 40000 10000

Description: Copies 64kByte from SDRAM address 0x1000_0000 to SPI Flash address 0x4_0000

SPI Flash Erase

sf erase <SPI Flash address> <Bytes>

Example: sf erase 100000 1000

Description: Deletes SPI Flash content from address 0x10_0000 to 0x10_0FFF

Note: The Bytes information needs to be sector size aligned!

SD/MMC Card

Switch between MicroSD, SD Slot and eMMC

mmc dev <Slot number> <Partition number>

Example: mmc dev 0

Description: Switch between SD/MMC Slots: 0 --> SD/MMC Slot, 1 --> MicroSD Slot, 2 --> eMMC Flash

Note eMMC flash partition number: 0 --> User partition, 1 --> Boot partition 1, 2 --> Boot partition 2

Initialize SD/MMC Card

mmc rescan

Description: Initialize new inserted SD Card

Show SD/MMC information

mmcinfo

Description: Shows SD/MMC device information

Device: FSL_SDHC
Manufacturer ID: 45
OEM: 100
Name: SEM08
Tran Speed: 52000000
Rd Block Len: 512
MMC version 4.41
High Capacity: Yes
Capacity: 7.3 GiB
Bus Width: 8-bit

Write to MicroSD, SD Slot and eMMC

mmc write <SDRAM address> <block number> <block count>

Example: mmc write 11000000 5000 400

Description: Write 512kByte (device block size is 512Byte) to the eMMC offset 10MByte.

Read from MicroSD, SD Slot and eMMC

mmc read <SDRAM address> <block number> <block count>

Example: mmc read 11000000 5000 400

Description: Read 512kByte (device block size is 512Byte) from the eMMC offset 10MByte.