On Wed, Jul 12, 2017 at 2:29 PM, Kenny Koller <[email protected]> wrote: > Can someone help me understand the output of U-Boot? Please see my questions > inline in green below. Also is there a sort Theory of Ops for U-Boot? I > found a User Manual at the DENX site but nothing about the details of the > boot sequence and how/where it searches for things. Thanks.
best details: https://lists.denx.de/listinfo/u-boot > U-Boot SPL 2017.01 (Jun 28 2017 - 23:47:37) > Trying to boot from MMC1MMC partition switch failed > > > I know what a partition is. What is a partition switch? > > *** Warning - MMC partition switch failed, using default environment > > Was it trying to read the environment from a partition or boot? We haven't > launched U-Boot yet so what environment is this? Loaded to memory? Where? > > > reading u-boot.img > reading u-boot.img > > > Why is U-Boot being read twice? it tried to raw read u-boot.img but switch to the 1st partition in the second read. > > > > U-Boot 2017.01 (Jun 28 2017 - 23:47:37 +0000) > CPU : AM335X-GP rev 2.1 > I2C: ready > DRAM: 512 MiB > MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1 > ** First descriptor is NOT a primary desc on 1:1 ** > > > Does this mean a bootable partition? Looks to be MMC 1 partition 1 which > would be true as I erased it. Why is it so upset about this? It's no unheard > of to boot from an SD card (and lots of other methods). > > > *** Warning - bad CRC, using default environment > > > Found the answer to this on the DENX site: It's trying to read an > environment from uninitialized flash. > > > <ethaddr> not set. Validating first E-fuse MAC > Net: cpsw, usb_ether > Press SPACE to abort autoboot in 2 seconds > switch to partitions #0, OK > > > Partitions are referred to as 1-4 (at least with MBR). What is zero? > > > mmc0 is current device > SD/MMC found on device 0 > reading boot.scr > ** Unable to read file boot.scr ** > reading uEnv.txt > 411 bytes read in 3 ms (133.8 KiB/s) > Loaded env from uEnv.txt > > > I do have a uEnv.txt on a partition 1 (FAT) of MMC0 (SD card). I've added an > echo statement but I'm not seeing anything from it. Should I? I was > expecting it to execute it like script in the hush shell. Maybe it only > assigns variables? With the above it looks to be using MMC0 (SD card). Does > it only look at the bootable partition (FAT in my case) or will it also > attempt to find this file elsewhere? the function called is: env import -t -r $loadaddr $filesize nothing get's echoed.. > > Importing environment from mmc0 ... > switch to partitions #0, OK > mmc0 is current device > Scanning mmc 0:1... > switch to partitions #0, OK > mmc0 is current device > SD/MMC found on device 0 > 5655304 bytes read in 389 ms (13.9 MiB/s) > 34643 bytes read in 43 ms (786.1 KiB/s)I## Flattened Device Tree blob at > 88000000 > > Booting using the fdt blob at 0x88000000 > Loading Device Tree to 8fff4000, end 8ffff752 ... OK > > > What is going on here? The DT was at 8800.0000 is it being moved? u-boot's relocating things.. raw mode is much cleaner: https://gist.github.com/RobertCNelson/a61e391168cdd4485a641097cc780aec Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYgJXFMxORnPBYx36WnyRSKcgDOEAZT5jqXbZpzWy1z7bA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
