# Booting kernel from Legacy Image at 80007fc0. Setenv bootargs console=ttyO0,115200n8 $ root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait Load mmc 1:2 0x80F80000 /boot/am335x-boneblack.dtbĪnd boot with the ext4 root filesystem being loaded from /dev/mmcblk0p2 UBoot will then load the Linux Kernel and compiled Device Tree Binary blob from eMMC: uBoot will attempt to load this file and append the extra variables: This default space includes a variable bootenv=uEnv.txt and associated script that allows additional variables to be added or overwritten by adding them to an uEnv.txt file placed on the FAT partition. UBoot will load using a default environment space. No micro SD card found, setting mmcdev to 1 *** Warning - readenv() failed, using default environment This second stage bootloader is also found on the FAT partition with the filename of "u-boot.img" MLO is a first stage uBoot Bootloader designed to load a second stage uBoot bootloader with enhanced features. USB Host mode controller at 47401800 using PIO, IRQ 0 First a note that may to help avoid confusion.
#U BOOT FOR BEAGLEBONE BLACK HOW TO#
USB Peripheral mode controller at 47401000 using PIO, IRQ 0 Beaglebone Black is a fairly common board so seems to be a reasonable choice for an example of how to enable verified boot using U-Boot. Musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, HB-ISO Rx, HB-ISO Tx, SoftConn) MLO Booting (uBoot SPL Second Program Loader): This means the ROM looks for a TOC at four specific offsets. If using eMMC, this file is loaded using RAW mode. The Sitara AM3359 will try to load and execute the first stage bootloader called "MLO" from a Fat 12/16 or 32 bit MBR based filesystem. This allows the BeagleBone Black to bypass the onboard eMMC and boot from the removable uSD (provided no valid boot device is found on SPI0.) This can be used to recover from a corrupted onboard eMMC. If the boot switch (S2) is held down during power-up, the ROM will boot from the SPI0 Interface first, followed by MMC0, USB0 and UART0. By default, the ROM in the Sitara AM3359 will boot from the MMC1 interface first (the onboard eMMC), followed by MMC0 (MicroSD), UART0 and USB0.
0 kommentar(er)
