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Acer Iconia Tab A700 (acer-picasso2)

From postmarketOS Wiki
Acer Iconia Tab A700
File:Picasso2-img-front.png
Manufacturer Acer
Name Iconia Tab A700
Codename acer-picasso2
Released 2012
Type tablet
Hardware
Chipset Nvidia Tegra 3 (T30)
CPU 1.3 GHz
GPU ULP GeForce
Display 1920x1200
Storage 16/32/64 GB
Memory 1 GB
Architecture armv7
Software
Original software
The software and version the device was shipped with.
Android 4.0
Extended version
The most recent supported version from the manufacturer.
Android 4.1
FOSS bootloader no
postmarketOS
Mainline
Instead of a Linux kernel fork, it is possible to run (Close to) Mainline.
no
pmOS kernel
The kernel version that runs on the device's port.
5.19.0-rc8

Contributors

Users owning this device

  • Jdxxxr (Notes: porting (or at least try to))

How to enter flash mode

Instructions can be found in #See also.

APX

It is possible to use fusee with the payload uart_payload_n7.bin (for UART A). This enables building a blob.bin. The blob.bin is used with wheelie in order to enable APX/nv3p access. Fusee and the payload is included in the tegra30_debrick tools repository. Wheelie source code can also be found in: #See also.

In theory (as soon as a fully working port is made) it is possible to run u-boot bootloader using fusee-tools. Note that only a701.bct (3G-variant of the device) is available in the repo for now.

./run_bootloader.sh -s T30 -t ./bct/a701.bct -b u-boot-picassomf/u-boot-dtb-tegra.bin

Installation

Installation not supported for now.

Status (work-in-progress mainline)

PostmarketOS initramfs with debug-shell

what works:

  • USB networking
  • basic tegrafb display output

DTS includes timings generated with the tool linked at this page Nvidia_Tegra.

Status (downstream)

Warning: So far only booting using the fastboot boot boot.img and flashing to a micro SD card has been tested.
Commands for flashing rootfs to a micro sd card and exporting/booting the boot.img (using fastboot) can be found in the Pmbootstrap guide.

  • Graphics is broken
  • USB networking with telnet and SSH works
  • micro sd card slot works

Serial console

Warning: Use with care

It is possible to change pinmux to have serial port uarte (UART 5) available on the sdcard slot pins. A breakout board and a logic analyzer can be used to read messages. In this case sigrok-cli was used like this: sigrok-cli -d <driver> --config samplerate=1m --continuous -P uart:baudrate=115200:rx=<channel> --channels <channel> -B uart=rx. The usual UART to USB adapters should work as well.

Until now, only TXD (available on DAT3/CS) has been tested working. Changing the pinmux is done in the DTS file. Refer to #See also for breakout board info and DTS.

reverse sdcard breakout board inserted into the tablet

See also