108 lines
3.8 KiB
Plaintext
108 lines
3.8 KiB
Plaintext
# Arch Linux on Nexus 7 Flo Native
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Here are my instructions on getting Arch Linux ARM natively booting on the
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Nexus 7 Flo. Ideally this would be booting from a usb stick or a dedicated
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partition on the mmc but this is working for me now. Once I get a bluetooth
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keyboard I will try to get it working from a usb stick.
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## BUGS!!!
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There is no frambuffer console :(
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If you cannot get it booting you will need to
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reboot into recovery and check /proc/last_kmsg for the errors. Or try and build
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the UART cable (which I failed at)
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There is only xf86-video-fbdev working and no DRM or anything fancy
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The Software Refresher in the kernel does not work. You will need to run my
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refresher app or fix the kernel :)
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1: I roughly followed the instructions form
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https://github.com/borh/nexus-7-2013-arch-scripts to get a working chroot
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first.
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2: Edit the init script to point to your arch.img or partition
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3: Edit and Run makebootimage.sh
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4: fastboot boot newboot
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5: ???
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6: Profit
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## To get WiFi Working
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A normal Nexus 7 Flo boot will call /system/bin/conn_init which does a whole
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lot of verifying your mac address and then writes out a config with the mac
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address in it. Very annoying. To get around this you need a copy of the wifi
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configs and manually enable the wifi driver since it does not start on boot.
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The firmware.service is only needed since I do not load the firmware in the
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initramfs (which I am haven't done yet)
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1: Copy /system/vendor/firmware [android] to /usr/lib/firmware [arch]
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2: rm /usr/lib/firmware/wlan/prima/{WCNSS_qcom_cfg.ini,WCNSS_qcom_wlan_nv.bin} <-- these are simlinks
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3: cp /data/misc/wifi/{WCNSS_qcom_cfg.ini,WCNSS_qcom_wlan_nv.bin} /usr/lib/firmware/wlan/prima/ <-- these are the files which conn_init writes your mac address to
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4: Copy firmware.service to /etc/systemd/system/
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5: ln -s /etc/systemd/system/firmware.service /etc/systemd/system/multi-user.target.wants/firmware.service
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6: Create a wpa_supplicant-nl80211@wlan0.service with your wpa_supplicant.conf
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details
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7: ln -s /etc/systemd/system/dhcpcd.service /etc/systemd/system/multi-user.target.wants/dhcpcd.service
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8: ln -s /etc/systemd/system/sshd.service /etc/systemd/system/multi-user.target.wants/sshd.service
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NOTE: The wifi drivers are really flakey. You might have better luck with a
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static ip. If anything fails reboot into recovery and check /proc/last_kmsg
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## To get X working
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Since there is no framebuffer console you cannot start X manually (unless you
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are able to get ssh working, see above) Auto login is your friend.
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Be sure to install a window manager or something first and then follow
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https://wiki.archlinux.org/index.php/Automatic_login_to_virtual_console and
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https://wiki.archlinux.org/index.php/Start_X_at_Login
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Your .xinitrc should contain something like
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~/refresher &
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exec awesome
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## Refreshing (refresher.c)
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Since the MSMFB_SW_REFRESHER does not seem to be working i wrote this instead.
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Just compile and put in you ~/ or whereever so xinit can run it.
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# Kernel stuff
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## To get Touchscreen working
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Apply 0001-make-ektf3k-driver-report-non-MT-events-too.patch
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## Kernel configs
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I used the following additional configs to get this working. Some might not be
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necessary but it helps with debugging
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I havent figured out how to get fbdev working with RGBA8888 so use RGB565 for
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now
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CONFIG_FB_MSM_DEFAULT_DEPTH_RGB565=y
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CONFIG_FHANDLE=y
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CONFIG_DEVTMPFS=y
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CONFIG_UTS_NS=y
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CONFIG_IPC_NS=y
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CONFIG_USER_NS=y
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CONFIG_PID_NS=y
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CONFIG_NET_NS=y
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CONFIG_DEVPTS_MULTIPLE_INSTANCES=y
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CONFIG_FANOTIFY=y
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CONFIG_FANOTIFY_ACCESS_PERMISSIONS=y
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CONFIG_DETECT_HUNG_TASK=y
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CONFIG_DEBUG_SPINLOCK=y
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CONFIG_DEBUG_MUTEXES=y
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CONFIG_DEBUG_ATOMIC_SLEEP=y
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CONFIG_STACKTRACE=y
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CONFIG_DEBUG_BUGVERBOSE=y
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CONFIG_SECURITY_SELINUX_BOOTPARAM=y
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## Build initramfs
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1: Edit makebootimage.sh with paths
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2: cd systemd-initramfs; find . | cpio -o -H newc | gzip > ../minimal.initramfs
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3: ./makebootimage.sh
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