reMarkable Hardware

Hardware (rM2) / Photos

Spec

  • 1.2 GHz dual core ARMv7 Processor rev 5 (armv7l) - 32 bit
  • Features: half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm
  • 1 GB LPDDR3 SDRAM
  • 8 GB internal storage
  • 10.3” monochrome 1872 x 1404 resolution (226 DPI)
  • Wi-Fi 2.4GHz and 5GHz
  • USB-C
  • Accessory port - Pogo connector - dot on left side is in fact a host usb connector.

Display - VB3300-KCA

The rm2 does not use the embedded epdc (Electronic Paper Display Controller) of the imx7. Instead the e-Ink display is connected directly to the LCD controller. This means all stuff that the epdc would normally do is now done in software… The software that implements the epdc in software is called SWTCON by the reMarkable team. It’s closed sources.

The current workaround to get rm1 apps working on the rm2 is using the remarkable2-framebuffer project.

USB Ethernet interface

Remarkable rM2 device

Bus 001 Device 019: ID 04b3:4010 IBM Corp.

dmesg

[   82.766555] usb 3-2.2: new high-speed USB device number 8 using xhci_hcd
[   82.869459] usb 3-2.2: New USB device found, idVendor=04b3, idProduct=4010, bcdDevice= 4.14
[   82.869462] usb 3-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[   82.869464] usb 3-2.2: Product: RNDIS/Ethernet Gadget
[   82.869465] usb 3-2.2: Manufacturer: Linux 4.14.78 with 30b20000.usb
[   82.917995] cdc_ether 3-2.2:1.0 usb0: register 'cdc_ether' at usb-0000:09:00.3-2.2, CDC Ethernet Device, a6:94:aa:fa:e4:b6
[   82.930455] cdc_ether 3-2.2:1.0 enxa694aafae4b6: renamed from usb0

Driver is cdc_ether

$ lsmod | grep cdc
cdc_ether              20480  0
usbnet                 45056  1 cdc_ether

Issue

10.11.99.1 not reachable

Usb is recognized (dmesg similar to above) but no working ethernet interface associated or the link is down.

=> This is because of network change I made to define a static ip for thist host. see network.

  • when using networkd, an interface is created but down and not properly setup.
  • when using NetworkManager no interface is created unless explicitly authorized:
network:
  ethernets:
    # remarkable
    usb:
     match:
       name: enxa*
     dhcp4: yes

Manual Workaround to resolve this (not persistant).

Host must have a different ip (10.11.99.2) than remarkable which must be the gateway (10.11.99.1) with routing different the default

sudo ip addr add 10.11.99.2/8 dev enxa29094bedecc
sudo ip link set enxa29094bedecc up
sudo ip route delete default via 10.11.99.2 dev enxa29094bedecc
sudo ip route add 10.11.99.1/8 dev enxa29094bedecc metric 100

Additional issue only public key available for this pc ?

I had messed up the network config for the remarkable (host ip vs gateway). so ssh root@10.11.99.1 brougth me back to the host - not the remarkable -, and the host has password authentication disabled.

ssh -v -v -v -o PreferredAuthentications=password -o PubkeyAuthentication=no root@10.11.99.1

POGO pin

Resources

Written on February 5, 2021, Last update on June 12, 2021
remarkable hardware arm