OSD3358
build uboot 201507
編譯步驟如下：
$ cd $ wget https://github.com/steward-fu/pocketbeagle/releases/download/v1.0/gcc-4.9.tar.gz $ tar xvf gcc-4.9.tar.gz $ sudo mv gcc-4.9 /opt $ export PATH=$PATH:/opt/gcc-4.9/bin $ wget https://github.com/steward-fu/pocketbeagle/releases/download/v1.0/uboot-201507.tar.gz $ tar zxvf uboot-201507.tar.gz $ cd uboot $ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make am335x_evm_config $ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make
把MLO、u-boot.img放到第一個FAT分區，然後上電就可以看到UART訊息(115200 bps)
U-Boot SPL 2015.07 (Aug 23 2019 - 11:24:20)
reading args
spl_load_image_fat_os: error reading image args, err - -1
reading u-boot.img
reading u-boot.img
U-Boot 2015.07 (Aug 23 2019 - 11:24:20 -0400)
Watchdog enabled
I2C: ready
DRAM: 512 MiB
NAND: 0 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
reading uboot.env
** Unable to read "uboot.env" from mmc0:1 **
Using default environment
Net: <ethaddr> not set. Validating first E-fuse MAC
Phy 4 not found
cpsw, usb_ether
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0