content/projects/pxa1908/index.md

   1 ---
   2 title: "Mainline Linux on Marvell PXA1908"
   3 date: 2023-09-10T22:23:48+02:00
   4 ---
   5 The Marvell PXA1908 was Marvell's first ARM64 SoC released sometime around 2014
   6 or 2015. The SoC is used in some of Samsung's entry level 2015 phones such as
   7 the [Core Prime VE
   8 LTE](https://wiki.postmarketos.org/wiki/Samsung_Galaxy_Core_Prime_VE_LTE_(samsung-coreprimevelte))
   9 and the [Xcover 3
  10 LTE](https://wiki.postmarketos.org/wiki/Samsung_Galaxy_Xcover_3_(samsung-xcover3lte)).
  11 The PXA1908 currently has out-of-tree support for booting mainline Linux.
  12
  13 ## Links
  14
  15 * [Latest version of patchset (v5)](https://lore.kernel.org/all/20230812-pxa1908-lkml-v5-0-a5d51937ee34@skole.hr/)
  16 * [Main Git
  17   repository](https://gitlab.com/LegoLivesMatter/linux/-/tree/pxa1908-lkml)
  18 * [postmarketOS SoC page](https://wiki.postmarketos.org/wiki/Marvell_PXA1908)
  19
  20 ## Building outside pmbootstrap
  21
  22 1. Clone and compile [pxa-mkbootimg](https://github.com/osm0sis/pxa-mkbootimg)
  23 1. Clone repository
  24 1. Checkout `pxa1908-lkml`
  25 1. Get [kernel
  26    config](https://gitlab.com/postmarketOS/pmaports/-/raw/master/device/testing/linux-samsung-coreprimevelte-mainline/config-samsung-coreprimevelte-mainline.aarch64)
  27    from pmaports
  28 1. `make` the kernel and create a boot.img using the below script
  29
  30 ## Script for creating boot.img
  31 Written to be run from `out/arch/arm64/boot`. Adapt to your needs.
  32
  33 ```sh
  34 #!/bin/sh
  35
  36 mkimage -A arm64 -C gzip -a 0x1000000 -e 0x1000000 -n "pxa1928dkb linux" -d Image.gz uImage
  37 ~/code/pxa-mkbootimg/pxa1908-dtbTool -p ../../../scripts/dtc/ -s 2048 -o dt.img dts/marvell/
  38 ~/code/pxa-mkbootimg/pxa-mkbootimg \
  39     --kernel uImage \
  40     --base 0x10000000 \
  41     --ramdisk /tmp/postmarketOS-export/initramfs \
  42     --ramdisk_offset 0x1000000 \
  43     --pagesize 2048 \
  44     --dt dt.img \
  45     --second_offset 0xf00000 \
  46     --tags_offset 0x100 \
  47     -o boot.img
  48 ```
  49
  50 ## Todo
  51 - [ ] Early mainlining
  52   - [x] Boot
  53   - [x] Serial
  54   - [x] USB networking
  55   - [x] `simplefb`
  56   - [x] Boots into rootfs on SD card
  57   - [ ] Boots into rootfs on eMMC *(LOW PRIORITY)*
  58   - [ ] PMIC driver
  59 - [ ] U-Boot
  60   - [ ] Boot
  61   - [ ] Serial (including loading kernel)
  62   - [ ] `simplefb`
  63   - [ ] Load kernel from external storage
  64   - [ ] USB
  65   - Don't know what else to put here