Group: Hardware/Computers/e-readers/Kobo/Aura H2O Edition 2

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Revision as of 10:55, 18 June 2018 by GNUtoo2 (talk | contribs) (→‎Serial/UART)
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External interfaces

USB

Several interfaces are exposed through USB:

  • It's possible to make the device switch to fastboot during boot
  • If the device is not registered, you can switch to mass-storage by selecting "no wifi" during the device boot.

Power button

Touchscreen

Internal interfaces

Serial/UART

Voltage 3.3v
Baudrate 115200
Settings 8N1 (the default almost everywhere)

PCB

Here are the chips on the top of the PCB. Caevats:

  • you need a big screen to view properly the markings as it will line-break with smaller screens
  • The markings might contain errors as they are tiny and some letter/number could be mixed up
  • I didn't disassemble it enough to see the bottom because the connectors seemed really fragile (they even had glue inside them) so if I do, I fear that I won't be able to put everything back in place. There might be some more chips on the bottom.
Usage Location Package Markings Driver(s) Documentation
512M RAM 168-Ball PoP-FBGA 
NANYA 1718
NT6TL 128M 32BQ-G0
7201166 AEP 3TW
?
? ? 
SEC 737
BO41
KLM8616EME
H56P4788D
?
System on a chip ? (BGA) 
MCIMX6V7DVN10AB
XAA 1739
TAIW HMAAXK
Lots of drivers
WiFi chip (and potentially other features) ? 
REALTEK
8189PTY
H857492
GH438
?
? ? 
RICOH AC5T619
1137
7409N1
Power management integrated circuit (and potentially other features) ? 
TPS
65185
T1 7AI
CS6S G4
?
On the display flex cable ? 
TT21000
-48L0I
1725 B03
PRD627959
PHI   □ C
041
?

Pictures

Some pictures of the top PCB taken with a camera:

Software

Kobo software

Stock OS analysis

  • The default OS forces the user to register or use some network services like Kobo, google, facebook, etc

Source code

Linux sources analysis

The sources have multiples boards selected: 

CONFIG_MACH_MX6Q_ARM2=y
CONFIG_MACH_MX6SL_ARM2=y
CONFIG_MACH_MX6SL_EVK=y
CONFIG_MACH_MX6SL_NTX=y
# CONFIG_MACH_MX6Q_SABRELITE is not set
CONFIG_MACH_MX6Q_SABRESD=y

However there is a gen_bootimg.sh with inside: 

./mkbootimg --kernel arch/arm/boot/zImage --ramdisk uramdisk.img --base 0x80800000 --cmdline "console=ttymxc0,115200 init=/init androidboot.console=ttymxc0 max17135:pass=2, fbmem=6M video=mxcepdcfb:E060SCM,bpp=16 no_console_suspend" --board evk_6sl_eink -o boot.img

This seem to indicate that the file describing the e-reader hardware is arch/arm/mach-mx6/board-mx6sl_evk.c (along with arch/arm/mach-mx6/mx6sl_evk_pmic_pfuze100.c)

The source code of this file seem to be derived from a single board computer from Freescale/NXP, but it is odd as some features not present in this e-reader hardware aren't disabled at compilation time.

Firmwares

Since Linux and u-boot sources are available, the most interesting information (for RYF certification) to look for is if some peripherals require a non-free firmware. The most common places where firmwares can be used or required are:

  • The WiFi/bluetooth driver
  • The touchscreen driver

It might also be a good idea to double check that the e-paper display only needs some calibration data and doens't require any nonfree firmware

GPU

According to the linux compilation configuration the GPU is unused: 

#
# MXC Vivante GPU support
#
# CONFIG_MXC_GPU_VIV is not set

WiFi

The WiFi chip seem to use an out of tree driver: 

CONFIG_WLAN=y
# CONFIG_USB_ZD1201 is not set
# CONFIG_WIFI_CONTROL_FUNC is not set
# CONFIG_BCM4329 is not set
# CONFIG_BCMDHD is not set
# CONFIG_HOSTAP is not set

This will need a bit more research to get some confirmation on that

Boot logs

Manufacturer informations

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