Very lightweight Linux on old Asus Transformer T100TAF

How do modify the initrd on puppy

Initrd can be unpacked and modified as needed.

To repack it, run in the same folder: find ./ | grep -v initrd.gz | cpio -H newc -o | gzip -6 > initrd.gz 

How to modify it on the device, in flash - run this as a script on the device stopped in initrd:
#!/bin/sh

mkdir /mnt/boot
mkdir /mnt/usb

mount /dev/sda1 /mnt/usb
mount /dev/mmcblk1p1 /mnt/boot

cp /mnt/usb/initrd.gz /mnt/boot/

HOWTO

System description:
- 1GB RAM
- Intel Atom Z3735G
- 32GB MMC
- card reader
- docking keyboard with USB 3.0 port

# Puppy Linux

RESULT: no wireless out of the box with BionicPup64 8.0, device does not show up in lspci either (hw kill switch?)

How to install:
- download image http://puppylinux.com/index.html#download
- format USB drive with FAT32 partition
- using Unetbootin, write iso to formatted USB drive
- download Grub2 UEFI 32-bit version from here http://distro.ibiblio.org/fatdog/packages/700/grub2-efi32-2.00-i686-1.txz [1]
- extract the tarball from previous step, find grubia32.efi and rename it to bootia32.efi
- on the USB drive create EFI/boot folder
- put bootia32.efi in EFI/boot folder on USB drive

NOTE: use Unetbootin instead of Etcher or dd to be able to edit the partition after - it is similar to Rufus ISO mode.

How to boot [2]:
- plug in USB
- power up tablet
- enter BIOS on tablet (with docking station, hit F2 or ESC at boot)
- disable secure boot

How to fix the wireless:
- download https://github.com/Asus-T100/firmware/blob/master/brcm/brcmfmac43340-sdio.txt
- copy to /lib/firmware/brcm
- modprobe -r brcmfmac
- modprobe brcmfmac

# Install to hdd
- did not write the exact steps, but just a few notes
- created EFI FAT32 partition and ext4 normal partition
- installed via script to ext4 partition (scripts said boot would not work, ignored)
- copied EFI/boot/bootia32.efi (keeping folder struct) folder from USB and: grub.cfg, initrd.gz, ldlinux.sys, vmlinuz from ext4 partition to EFI partition 
- using `pmedia=cd pfix=nocopy` (do not copy sfs to RAM)
- after boot and save everything works ok, no further problems
- NOTE: use x64 packet versions!

# Other problems
## SSH
- use Dropbear, easier to install and start: install, dropbear -R to generate the keys, service dropbear start
- to login: root/woofwoof
- not sure how to change the password, so simply disabled password logins by adding -s param to dropbear params (edited /etc/init.d/dropbear direcly, need to investigate correct way to do it

## Brightness
- to set it use `xrandr --output DSI-1 --brightness 0.5`
- see [3] for more details and a .pet for a taskbar control

## Keepass2
- to get it working `ln -s /usr/bin/mono /usr/bin/cli` [4]

## Screen rotation
- for now testing [5] with the following set:
TOUCHPAD='Asus Touchpad'
TOUCHSCREEN='SIS0817...' (get output from xinput)

## On screen keyboard
- install xvkbd if not already installed
- to config, set things in /etc/X11/app-defaults/XVkbd-common
- increased size: `XVkbd.geometry: 1000x300`
- removed keypad and function keys: `xvkbd.compact: true`


FOR MORE INFO SEE: https://wiki.debian.org/InstallingDebianOn/Asus/T100TA


References:
[1] http://blog.puppylinux.com/booting-slacko-63-on-uefi
[2] https://github.com/5bentz/linux-asus-t100/blob/master/T100TA_guide.md
[3] http://murga-linux.com/puppy/viewtopic.php?p=1004739&sid=071d912f26b6ff9c170447f0fddb6f96
[4] https://catonrug.blogspot.com/2014/05/keepass2-usr-bin-cli-no-such-file-or-directory-puppy-linux.html

TODO:
- side buttons not working
- sleep -> NOT WORKING, see link