On Wed 2017-10-25 14:28:07, Tony Lindgren wrote: > * Pavel Machek <pavel@xxxxxx> [171025 13:36]: > > Hi! > > > > ...hardware should be identical. 3.5.3-nemo kernel seems to work on > > both. 4.13-rc2 with display and clock patches boots on phone "S", but > > does not on phone "P"; nothing nothing is received on serial port. > > > > There is some difference in the bootloaders: S's bootloader provides > > lots of debug info, P's is silent. R&D settings do _not_ have > > influence on bootloader. We know P's serial works, as 3.5.3 kernel > > prints "Uncompressing linux...booting" there. > > > > I'll need to return "S" phone and serial cable tommorow. If you have > > any ideas, let me know. > > If you get nothing out of the uart, chances are the pins are > not muxed for the uart in nolo and maybe kernel dts is missing the > pinctrl entries for uart? > > Also try booting with mem=512M@0x80000000 or 256M or 768M. Maybe the > memory is different size or partially broken? Uhuh. It looks like "P" nokia really wants initrd, otherwise it will not boot. I got "uncompressing Linux 4.13" on serial console now, debug LEDs blinking, and if I use a flashlight, I see output on the screen, too. (What do I need to do to get the backlight working?) Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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