For compiling Linux kernel, refer this guide. At that time, we were detecting the display setup depending on the touch screen controllers present on the I2C bus. It required the kernel to know of a display and to recognize the boot parameter and then apply the values.

Linux kernel needs to be complied and placed onto the SD card in order to allow U-Boot to load it. SEE: BootROM Exploit based CheckRa1n Jailbreak released for iOS. U-Boot Tree: Branch: hikey_mmc_fix 2) Booting Linux Kernelįollowing instructions provides information about booting Linux kernel along with Debian distro from U-Boot. 0.000000 Kernel command line: earlycon console ttyPS0, 115200 clkignoreunused Again reboot the system, halt at u-boot now you can define the bootargs. This is an example for Xilinx zynq-7000 devices from the yocto meta-zybo layer: kernelimageuImage devicetreeimagezybo-zynq7.dtb bootargsconsolettyPS0,115200 root/dev/mmcblk0p2 rw rootwait earlyprintk uenvcmdecho Copying Linux from SD to RAM. The native U-Boot support for HiKey doesn’t directly allows to fetch kernel and device tree blob from any storage medium, it needs a bit of work to be done on the U-Boot command line.įirst, Build and Flash U-Boot onto HiKey from below tree using the instructions provided in the README. To echo rfs6136138 sometimes bootargs will not be set in u-boot env but it will be read from device-tree, In such cases just check the kernel command line in boot log. You can use a uEnv.txt file in your boot partition to specify arguments for the boot. Equally, some bootargs settings can be entirely cosmetic and simply add (or. This can be critical in determining whether a device boots at all or whether particular hardware is available in the booted system. U-Boot allows loading Linux Kernel from different file systems like FAT32, EXT4 etc… This allows us to place the kernel image and RFS (Root File System) on to SD card and eMMC for booting. U-Boot bootargs¶ U-Boot uses the bootargs (boot arguments) variable to specify the command line when booting a Linux kernel. This guide provides instructions for loading Linux Kernel from SD card using Das U-Boot (Universal Bootloader) Table of Contents

U boot bootargs