VIM1S have advanced and flexible booting sequence…

MCU ⇒ BROM ⇒ U-Boot ⇒ OS target

• FUNCTION + RESET - oowow mode
• FUNCTION x3 times - flash mode

More detail: hardware-buttons

~# bootmode
spi
 
~# bootmode mmc
[i] /opt/bootmode spi -> mmc(sd)
 
~# bootmode
mmc
 
~# bootmode spi
[i] /opt/bootmode mmc -> spi

~# mcu_oowow_mode set 1
[i] set with 1
 
~# mcu_oowow_mode clean
[i] set with 0
 
~# mcu_oowow_mode && echo activated
0x01
activated
 
~# mcu_oowow_mode clean
[i] set with 0
 
~# mcu_oowow_mode || echo disabled
disabled
 
~# i2cset -f -y 2 0x18 0x92 1
 
~# i2cget -f -y 2 0x18 0x92
0x01

Forced hardware reboot

~# mcu_reboot
 
~# i2cset -f -y 2 0x18 0x91 2

Current u-boot can start OS from USB ⇒ SD ⇒ eMMC ⇒ …

boot_targets

kedge2# printenv boot_targets 
boot_targets=usb0 mmc1 mmc0 pxe dhcp fail

default eMMC u-boot log for Ubuntu images

boot_targets

kedge2# printenv boot_targets 
boot_targets=usb0 mmc1 mmc0 pxe dhcp

MMC/SD boot areas

1STBLOB 0x00000200        0x0002a000
BL2E    0x0002a200        0x00013000
BL2X    0x0003d200        0x00011000
DDRFIP  0x0004e200        0x00040000
DEVFIP  0x0008e200        0x00300000

SPI-Flash boot areas

1STBLOB 0x00000000        0x0002a000
BL2E    0x00054000        0x00013000
BL2X    0x0007a000        0x00011000
DDRFIP  0x0009c000        0x00040000
DEVFIP  0x0011c000        0x00300000