Amazon Kindle Fire (amazon-otter)

Features
Flashing
USB Networking	Works
Internal storage
SD card
Battery	Works
Screen	Partial
Touchscreen	Works
Multimedia
3D Acceleration
Audio
Camera Flash
Connectivity
WiFi	Works
Miscellaneous
FDE
USB OTG	Works
HDMI/DP
Sensors
Accelerometer	Works
Magnetometer
Ambient Light
Proximity
Hall Effect
Haptics
Barometer

Amazon Kindle Fire (1st Gen)
Manufacturer	Amazon
Name	Kindle Fire (1st Gen)
Codename	amazon-otter
Released	2011
Type	tablet
Hardware
Chipset	TI OMAP 4430 GP
CPU	Dual-core 1.0 GHz Cortex-A9
GPU	PowerVR SGX540
Display	600 x 1024 IPS LCD
Storage	8 GB
Memory	512 MB
Architecture	armv7
Software
Original software	Android
Original version	2.3
postmarketOS
Category	testing
Pre-built images	no
Mainline	yes

Contributors

Foldmorepaper
h_ro

Users owning this device

Foldmorepaper
Foldmorepaper (Notes: Stuck on orange screen)
H ro (Notes: kernel v5.11/v5.12)
Newblicious (Notes: Using twrp-2.8.4, reverted back to cm11)

Root and Fastboot

If the device can reach fastboot mode, the device does not need to be rooted to install recovery since the stock bootloader is already unlocked. Typically, a "Motorola factory cable" is needed to power the device into fastboot mode, but with root and fbmode utility, the device can reboot into fastboot mode without the special cable.

Rooting with saferoot

Source: https://forum.xda-developers.com/t/root-saferoot-root-for-vruemj7-mk2-and-android-4-3.2565758/#post-48392009

$ wget https://forum.xda-developers.com/attachments/saferoot-zip.2760984/ -O saferoot.zip
$ mkdir saferoot
$ cd saferoot
$ unzip ../saferoot.zip
$ ./install.sh

Booting into fastboot from Android

Source: https://forum.xda-developers.com/t/fastboot-stock-6-2-1-fastboot-mode-without-rooting-or-cables.1414832/

$ wget https://forum.xda-developers.com/attachments/fbmode-zip.833582/ -O fbmode.zip
$ unzip fbmode.zip
$ adb push fbmode /data/local/tmp
$ adb shell chmod 755 /data/local/tmp/fbmode
$ adb shell /data/local/tmp/fbmode
$ adb reboot

Custom Bootloader

A custom version of Hashcode's (2014) u-boot port with device tree support is required to boot mainline Linux kernel. The following steps are based off of h_ro's documentation repo.

Toolchain used: Linaro GCC4.9 ARMv7 Baremetal

Build steps

$ wget https://releases.linaro.org/components/toolchain/binaries/4.9-2017.01/arm-eabi/gcc-linaro-4.9.4-2017.01-x86_64_arm-eabi.tar.xz
$ tar -xvf gcc-linaro-4.9.4-2017.01-x86_64_arm-eabi.tar.xz
$ export CROSS_COMPILE=$PWD/gcc-linaro-4.9.4-2017.01-x86_64_arm-eabi/bin/arm-eabi-
$ git clone https://github.com/hansemro/kf_u-boot.git u-boot
$ cd u-boot
$ make ARCH=arm distclean
$ make ARCH=arm omap4_kc1 -j$(nproc)

Installing bootloader

Set the device to fastboot mode and flash the bootloader directly with fastboot.

$ fastboot flash bootloader u-boot.bin

u-boot version should appear on the top right corner when lcd menu is entered. For postmarketOS, version L2.13 or newer is required.

Custom Recovery: TWRP

Download an otter recovery image from TWRP website here.

Set the device to fastboot mode and flash the recovery with fastboot.

$ fastboot flash recovery twrp-2.8.1.0-otter.img

Note: TWRP v2.X does not seem to support postmarketOS recovery-based install scripts.

Installation

$ pmbootstrap init
$ pmbootstrap install --split
$ pmbootstrap export
$ fastboot flash media /tmp/postmarketOS-export/amazon-otter-root.img
$ fastboot flash cache /tmp/postmarketOS-export/amazon-otter-boot.img

For more advanced installation methods, see here.

Note: If root image exceeds ~400MB, fastboot no longer becomes suitable method of installation due to bootloader limitations.

Stock Partition Layout

Output of parted /dev/block/mmcblk0 print while in TWRP recovery:

Model: MMC M8G2FA (sd/mmc)
Disk /dev/block/mmcblk0: 7734MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number	Start	End	Size	File system	Name
1	131kB	262kB	131kB		xloader
2	262kB	524kB	262kB		bootloader
3	524kB	11.0MB	10.5MB		dkernel
4	11.0MB	212MB	201MB	ext4	dfs
5	212MB	229MB	16.8MB		recovery
6	229MB	296MB	67.1MB	ext4	backup
7	296MB	307MB	10.5MB		boot
8	307MB	312MB	5243kB	ext4	splash
9	312MB	849MB	537MB	ext4	system
10	849MB	2041MB	1192MB	ext4	userdata
11	2041MB	2309MB	268MB	ext4	cache
12	2309MB	7690MB	5380MB	fat32	media