Kontron Bootloader Environment Extensions; Bootloader Mass Storage Support; Qspi Flash; Table 44: Bootloader Environment Extensions - Kontron pITX-iMX8M User Manual

7.7. Kontron Bootloader Environment Extensions

To support PITX-iMX8M board properly, Kontron adds some environment variables to the standard set of variables
provided by mainline U-Boot. These variables are shown below.

Table 44: Bootloader Environment Extensions

Variable Value
board_name pitx-imx8m
board_serial
UTD080002
cpu armv8
eth1addr From I210/I211 iNVM
ethaddr From EEPROM
fdt_addr_r 0x43000000
kernel_addr_r 0x40480000
pxefile_addr_r 0x40480000
ramdisk_addr_r 0x44000000
fdtfile
pitx-imx8m_hdmi.dtb
hw_rev L130
scriptaddr
0x40400000
serial# From SoC
soc imx8m
soc_type imx8mq
vendor kontron
video_off no
Variables from the table above marked in bold are set automatically each time U-Boot
starts. They will override different settings possibly stored in persistent environment.

7.8. Bootloader Mass Storage Support

U-Boot provides support to read and write from mass storage devices like


QSPI flash

 eMMC device
 SD card
 USB thumb device
7.8.1. QSPI flash
QSPI flash is accessed using the "sf" command
Example: Load one sector (64K) from SPI flash
=> sf probe 0
=> sf read ${loadaddr} 0 10000
Description
Board serial number read from KEU EEPROM
CPU family
Ethernet port FEC1 MAC address
Ethernet port FEC0 MAC address
DTB load address used by distroboot
Kernel load address used by distroboot
PXE load address as required by distroboot spec.
Ramdisk load address used by distroboot
Default device tree file for the module
Board revision read from strappings
Script file load address used by distroboot
SoC internal serial number
SoC and SoC type
Enable video by default
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pITX-iMX8M – Rev. 1.1
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