Interupt the automatic boot process and just type run loadmmc Part to a separate variable, so if we want to tweak some things, we can Unless interupted at boot, u-boot will then execute the contents of theīootcmd env variable. Named uboot.env on the sd card and will automatically load it on The saveenv command will save the current environment to a file
Setenv bootcmd 'run loadmmc bootz $loadaddr - $fdt_addr_r' Setenv loadmmc 'load mmc 0:1 $loadaddr zImage load mmc 0:1 $fdt_addr_r $fdtfile' Setenv bootargs 8250.nr_uarts=1 earlyprintk console=ttyS0,115200
#U BOOT RASPBERRY PI SERIAL#
Serial uart correctly on wifi boards echo 'dtoverlay=miniuart-bt' >/run/media/$USER/boot/config.txtīoot the RPi with the sd card, you should see u-boot comming up on the serial console. Time ionice -c3 nice -n10 make -j5 zImage dtbs # we will also need modules later: make -j5 zImage dtbs modules # or # ls arch/arm/configs/bcm* #device tree # we "pretend" u-boot is kernel )Ĭp u-boot.bin /run/media/$USER/boot/kernel.img # check out a version that does not need GCC 6 # (you can use master if you compiled your own toolchain with newer GCC)Įxport CROSS_COMPILE=arm-linux-gnueabihf. Manually booting with different commandlines without having to edit
Loading it, but u-boot gives us more flexibility (loading kernels from usb/network, Note: we don't really need u-boot to boot the kernel on raspberry, theīootcode.bin/ start.elf bootloader is capable of There are however some pre-built toolchains in the raspberry repos:Įxport PATH=$PWD/tools-master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-圆4/bin/:$PATHĮxport PATH=$PWD/tools-master/arm-bcm2708/arm-rpi-4.9.3-linux-gnueabihf/bin/:$PATHĬp bootcode.bin fixup.dat start.elf /run/media/$USER/boot/ Note: if you built your own toolchain using toolchain-ng, you can of course use that. Rapsberry Pi 0 - U-Boot and (rpi foundation) kernel Toolchain
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