The original design had the if statement checking the result of "mmc rescan", but I guess if that fails, it will probably stop with some error anyway. This is not a great answer, but at least I got it to work. So, for some reason, using an "if" statement in the bootcmd script (even a trivial one) breaks it, although I don't know why. When SPL is built the IVT will also be generated and added at the beginning of the final SPL image. The U-boot itself would in normal cases be too big to be loaded to internal RAM and that is why a subset is used.
#U boot manual code#
However, if I press a key to interrupt the auto-boot, then type "boot" or "run bootcmd", it boots fine (although it's running exactly the same script). SPL is part of the U-boot source code and can be seen as a small subset of U-boot. (Formatted onto multiple lines for clarity).īy "fails", I mean that on power up, it waits for the auto-boot timeout, loads the kernel and dtb, then hangs at "Starting Kernel." and must be powered off or reset. Setenv bootargs console=$ Įcho Boot FAILED: Couldnt find kernel or dtb Setenv mmcroot /dev/mmcblk1p2 rootwait ro This is the top level of the U-Boot’s documentation tree. Here's my bootcmd U-Boot env variable (formatted for easy reading): bootcmd= removed the check for a boot script and network boot). I want to make the boot sequence as lean and fast as possible, so I streamlined some of the checks and tests done by U-Boot (e.g. U-Boot is an open-source, cross-platform boot loader that provides out-of-box support for hundreds of embedded boards and many CPUs, including PowerPC, ARM, XScale, MIPS, Coldfire, NIOS, Microblaze, and x86. It booted fine off an SD card, and I wanted to experiment with customized boot commands in U-Boot.
I've built an image for a Freescale iMX6 EVK board (ARM based), using Buildroot.
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