postmarketOS

lg hammerhead (Google Nexus 5)

Contributors

• MartijnBraam
• dzervas
• lawl

What works

• Compiling the LineageOS kernel
• SSH
• Booting
• Flash light
• Battery
• Weston + Touchscreen (with ugly hacks and the red screen bug)

fastboot boot /mnt/rootfs_lg-hammerhead/boot/vmlinuz-lg-hammerhead /mnt/rootfs_lg-hammerhead/boot/initramfs-lg-hammerhead

What does not work

• Proprietary video driver (#29)
• Flashing the compiled LineageOS kernel via pmbootstrap (#35)
• WiFi (firmware needed)
• Front led

[00:33:38] (native) flash kernel 'lg-hammerhead'
creating boot image...
creating boot image - 3600384 bytes
sending 'SHLVL=1' (3516 KB)...
OKAY [  0.331s]
writing 'SHLVL=1'...
FAILED (remote: partition table doesn't exist)
finished. total time: 0.511s
[00:33:38] ERROR: Command failed: (native) % fastboot --base 0 --kernel-offset 0x00008000 --ramdisk-offset 0x02900000 --tags-offset 0x02700000 --page-size 2048 flash:raw /mnt/rootfs_lg-hammerhead/boot/vmlinuz-lg-hammerhead /mnt/rootfs_lg-hammerhead/boot/initramfs-lg-hammerhead

Workaround (on host, not inside chroot):

mkbootimg --base 0 --pagesize 2048 --kernel_offset 0x00008000 --ramdisk_offset 0x2900000 --second_offset 0x00f00000 --tags_offset 0x02700000 --cmdline 'console=ttyHSL0,115200,n8 androidboot.hardware=hammerhead user_debug=31 maxcpus=2 msm_watchdog_v2.enable=1' --kernel ~/.local/var/pmbootstrap/chroot_native/mnt/rootfs_lg-hammerhead/boot/vmlinuz-lg-hammerhead --ramdisk ~/.local/var/pmbootstrap/chroot_native/mnt/rootfs_lg-hammerhead/boot/initramfs-lg-hammerhead -o pmos.img
fastboot boot pmos.img

There is also a bug and the screen is not updated. Workaround: login using ssh and run the following command:

ssh user@172.16.42.1
sudo su
while [ ! ]; do cat /sys/class/graphics/fb0/modes > /sys/class/graphics/fb0/mode; done

Links

• Kernel package

• Device package

• dmesg from mainline linux with the missing block devices

Photos

• Weston running (with the red screen bug)
• /r/postmarketOS post

Component support table

Component	Module	LineageOS Kernel	Mainline kernel
Storage	sdhci	Working	Working
WiFi	bcmdhd	Missing firmware	No
USB Networking		Yes	No
2D Video	mdss_fb	Screen not refreshing automatically	No
3D Video		Not in kernel	No
Debug serial		Yes, /dev/ttyHSL0	Yes, /dev/ttyMSM0