00:40 <kenny> couple more questions on the s905/gxbb arch for anyone that might know. Without a nand/emmc will it try the mmc? (and if so, does the bl2 at the start cause partition issues?). Next I see 'sign' stuff for the bl2 in different repos, but I thought the bl2 would be signed with an amlogic key, so how does that work?

00:47 <chewitt> boot flow is spi > nand/emmc > sd > usb

00:48 <chewitt> if you disable emmc (shorting pins is popular when you flash the wrong boot image) it will skip to sd > usb

00:49 <chewitt> see https://github.com/superna9999/linux/wiki/Amlogic-HDMI-Boot-Dongle for useful gadgets

00:50 <chewitt> the SoC checks a different location for the signed boot stuff on sd, which is 512 bytes/sectors? in .. so you don't have the conflict issue

00:51 <chewitt> I'm booting a WeTek Play2 (S905) box from mainline u-boot and kernels for some time; u-boot on SD but OS image on eMMC

01:20 <chewitt> bl2.bin is shipped by Amlogic (AFAICT) and most board specific stuff is in acs.bin

01:21 <chewitt> the 'FIP' signing process combines everything into the SoC family-specific order

01:21 <chewitt> see https://github.com/LibreELEC/amlogic-boot-fip/blob/master/gxbb.inc