06:31 <vpeter> yates: Not much discussions here :(

06:32 <vpeter> soc hot on boot: maybe there is no throttling and soc works max? Just don't stay too long in u-boot :-)

06:33 <vpeter> About bare metal program: Doesn't u-boot has some sample?

11:14 <dv_> we are all too busy with stuff :)

13:10 <otavio> yates: u-boot uses it in a fixed frequency; it disables some clocks which aren't need for booting to save some power and keep cool

14:29 <yates> ok, well thanks for th responses (except dv_... :)

14:30 <yates> also a question on the sdcard partition layout: "partition" 1: unformatted 4 MB, partition 2: FAT32, partition3: linux (ext3?)

14:31 <yates> is partition 1 used for u-boot?

14:31 <yates> partition 2 has the zImage and the dtb files

14:32 <yates> i didn't explicity see u-boot.img anywhere, so i'm guessing it's on partition 1 (which isn't really a partition)

14:32 <yates> that is, i mounted the fat32 and linux portions of a .img file and that (ab0ve) is what I saw.

14:37 <yates> is partition 1 used for u-boot?

14:52 <yates> !!!! is partition 1 used for u-boot??? !!!!

14:59 <yates> otavio: ?

15:02 <yates> vpeter: btw, good idea about u-boot. i should just hijack it and make my own custom boot thingie

15:14 <vpeter> yates: u-boot.img is used with SPL. If there is no SPL used then you have u-boot.imx which is written to 1024 bytes offset.

15:16 <vpeter> unformatted 4 MB is for make partitions aligned to 4MB to get optimized results.

15:17 <vpeter> So your "partition 2" is actually first one.

15:40 <yates> what is SPL?

15:41 <yates> vpeter: i removed everything from partition2 and i am getting u-boot messages

15:41 <yates> (i mounted the .img file on my desktop linux machine first, then unmounted it and did a dd if=.img of=/dev/sdcardreader

15:42 <yates> (i mounted the .img file on my desktop linux machine first, removed all files (zImage and the .dtb files) from partition 2 (the fat32), then unmounted it and did a dd if=.img of=/dev/sdcardreader

15:42 <yates> it behaved as expected - uboot booted and reported a few things, then went into shock since the linux kernel wasn't present

15:43 <yates> what is this SPL thing?

16:15 <vpeter> SPL https://stackoverflow.com/questions/31244862/what-is-the-use-of-spl-secondary-program-loader

16:23 <yates> is it possible that the chip would get hot when a gpio is configured for output and driving ground, or vice-versa?

16:24 <yates> is it possible that the chip would get hot when a gpio is configured for output, the output is logic high, and the output is driving ground, or vice-versa?

16:26 <yates> vpeter: thank you.

16:32 <yates> vpeter: so does SPL/uboot.imx mount the linux partition and then load /sdcard/linux/opt/images/Yocto/u-boot.img-sd to run the final u-boot?

16:37 <vpeter> SPL loads u-boot.img or there is only u-boot.imx

16:37 <vpeter> SPL/u-boot.img or u-boot.imx loads kernel and boot it. It doesn't really "mount" partition - just reads kernel file into ram and execute it.

16:37 <vpeter> Something like that - I'm not really technical in this.

16:46 <yates> vpeter: where does spl load boot.img from?

16:51 <vpeter> from some partition. Usually first one?

17:49 <yates> yeah, there is nothing named uboot there, just .dtb files and the zImage

18:06 <yates> does the imx6 internal boot rom code check the SD Detect signal when the boot config is set to boot from sdcard?

18:07 <yates> if so, then how doesn't that mean that the SD Detect signal must be muxed into a fixed, known GPIO?

18:07 <yates> s/how doesn't/doesn't/

18:08 <yates> vpeter: or did you mean, by "first partition," the 4MiB "partition"?

18:10 <vpeter> It depends how you look into this :)

18:10 <vpeter> For me first (1) partition is something which is really formatted.

18:14 <vpeter> This is image for LibreELEC: https://pastebin.com/V5G0i6Yr First

18:14 <vpeter> partition starts and 4MB.