[Letux-kernel] playing with PinePhone - rootfs, kernel etc.

[H. Nikolaus Schaller]

> Am 14.12.2019 um 13:16 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> The biggest problem was to find out where the µSD slot is :)
> 
> You have to pop open the full back cover and then there is a tiny combined µSIM and µSD reader near the battery.
> 
> Then I looked up where to get a bootable Linux. I did choose Ubuntu Touch:
> https://wiki.pine64.org/index.php/PinePhone#Ubuntu_Touch
> 
> I just did:
> 
> root at letux:~# wget -O - https://ci.ubports.com/job/rootfs/job/rootfs-pinephone/lastBuild/artifact/ubuntu-touch-pinephone.img.gz | gunzip | cat >/dev/sdb
> 
> and then the µSD looks like:
> 
> root at letux:~# ls -l /media/letux/ROOTFS
> total 92
> drwxr-xr-x   2 root root  4096 Dec 14 07:30 bin
> drwxr-xr-x   2 root root  4096 Dec 14 07:59 boot
> drwxr-xr-x   4 root root  4096 Dec 14 07:23 dev
> drwxr-xr-x 109 root root  4096 Dec 14 08:00 etc
> drwxr-xr-x   3 root root  4096 Dec 14 07:30 home
> drwxr-xr-x  19 root root  4096 Dec 14 07:58 lib
> drwx------   2 root root 16384 Dec 14 08:00 lost+found
> drwxr-xr-x   2 root root  4096 Dec 14 07:21 media
> drwxr-xr-x   2 root root  4096 Dec 14 07:21 mnt
> drwxr-xr-x   3 root root  4096 Dec 14 07:29 opt
> drwxr-xr-x   2 root root  4096 Apr 12  2016 proc
> drwx------   2 root root  4096 Dec 14 07:30 root
> drwxr-xr-x   8 root root  4096 Dec 14 07:29 run
> drwxr-xr-x   2 root root  4096 Dec 14 07:30 sbin
> drwxr-xr-x   2 root root  4096 Dec 14 07:56 script
> drwxr-xr-x   2 root root  4096 Dec 14 07:21 srv
> drwxr-xr-x   2 root root  4096 Feb  5  2016 sys
> drwxrwxrwt   2 root root  4096 Dec 14 07:30 tmp
> drwxr-xr-x  10 root root  4096 Dec 14 07:21 usr
> drwxr-xr-x  11 root root  4096 Dec 14 07:30 var
> root at letux:~# ls -l /media/letux/ROOTFS/boot/
> total 19840
> lrwxrwxrwx 1 root root      21 Dec 14 07:59 Image.gz -> Image.gz-5.4.0-pine64
> -rw-r--r-- 1 root root 7454037 Dec 12 18:18 Image.gz-5.4.0-pine64
> -rw-r--r-- 1 root root 3392125 Dec 12 18:18 System.map-5.4.0-pine64
> -rw-r--r-- 1 root root     725 Dec 14 07:59 boot-dontbeevil.scr
> -rw-r--r-- 1 root root     653 Dec 14 07:59 boot-dontbeevil.txt
> -rw-r--r-- 1 root root     724 Dec 14 07:59 boot-pinephone.scr
> -rw-r--r-- 1 root root     652 Dec 14 07:59 boot-pinephone.txt
> -rw-r--r-- 1 root root     722 Dec 14 07:59 boot-pinetab.scr
> -rw-r--r-- 1 root root     650 Dec 14 07:59 boot-pinetab.txt
> -rw-r--r-- 1 root root     724 Dec 14 07:59 boot.scr
> -rw-r--r-- 1 root root     628 Dec 14 07:59 boot.txt
> -rw-r--r-- 1 root root  158964 Dec 12 18:18 config-5.4.0-pine64
> lrwxrwxrwx 1 root root      33 Dec 14 07:59 dtb -> /usr/lib/linux-image-5.4.0-pine64
> -rw-r--r-- 1 root root 4634987 Dec 14 07:59 initrd.img
> -rw-r--r-- 1 root root 4634987 Dec 14 07:59 initrd.img-5.4.0-pine64
> root at letux:~# 
> 
> Quite up-to date that it comes with a v5.4 kernel :)
> 
> U-Boot is very likely sitting in a hidden partition like for Udoo neo
> or the Kobilino. fdisk says:
> 
> Device     Boot Start     End Sectors  Size Id Type
> /dev/sdb1  *     1953 7812499 7810547  3.7G 83 Linux
> 
> So it does not look difficult to teach makesd to build a bootable µSD.
> And teaching the Letux kernel to support CONFIG_ARCH_SUNXI.
> 
> My biggest barrier seems to be that it is ARM64 and I have no ARM64
> toolchain in my kernel build setup... Maybe it can also run with 32 bit
> like the RasPi?
> 
> Anyways I now need to test the µSD in the device.

Hm. Doesn't boot :(

Without µSD,pressing the power button or plugging in the USB-C
cable makes the flash/torch light go on for a moment and makes
the display show a red-green-blue bar for a moment. With µSD
there is no reaction. Which means that it changes something.

Hm. Is there a serial console somewhere?

BR,
Nikolaus