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Does anyone know of a way to get U-boot version installed from userspace? There is the fw_printenv command that provides access to U-boot's environment variables, but not the version.
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A bulletproof way of accomplishing this would be to pass your u-boot version to the kernel (uboot=blah) and then read /proc. If you're want to make sure you know for sure what version you booted with, not just whats on the flash.
The U-Boot fw-utils is a tool provided by the bootloader that contains the fw_printenv and fw_setenv utilities to read and write U-Boot environment variables from Linux user space. It is supported out-of-the-box in the Yocto compatible Toradex Embedded Linux BSP, which uses the OpenEmbedded build system.
U-Boot is both a first-stage and second-stage bootloader. It is loaded by the system's ROM (e.g. onchip ROM of the ARM CPU) from a supported boot device, such as an SD card, SATA drive, NOR flash (e.g. using SPI or I²C), or NAND flash.
Das U-Boot ("the Universal Boot Loader" or U-Boot) is an open-source bootloader that can be used on ST boards to initialize the platform and load the Linux® kernel. Read the README file before starting using U-Boot.
If U-boot is located in mtd0, you can get version info as follows:
root@SUPERWIFI:/proc# strings /dev/mtd0 | grep U-Boot
U-Boot 1.1.4-g1c8343c8-dirty (Feb 28 2014 - 13:56:54)
U-Boot
Now running in RAM - U-Boot at: %08lx
Just an update for this. In our version of U-Boot we changed the code for main_loop() in main.c to this:
#ifdef CONFIG_VERSION_VARIABLE
char *oldver=getenv("ver");
if(oldver==0 ||strcmp(oldver,version_string))
{
setenv("ver", version_string); /* set version variable */
saveenv();
}
#endif /* CONFIG_VERSION_VARIABLE */
So setenv/saveenv is only called, if needed by an update. In our firmware we added
/sbin/fw_printenv -n ver > /var/config/u-boot.ver
to make the u-boot version public available.
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