Adding OpenWrt support for Mikrotik SXTG-2HnD v2

[johnth]

@huggo

Hi johnth,

Several questions comes in my mind:

• Is the serial interface of AR9344 has already been used by someone on Mikrotik product?
  I asking that because when I read the data-sheet I see UART lines could be multiplexed to available GPIO pins. So Mikrotik could have connectedt RX/TX not to default pins !

No guarantee the pads are even connected to the SoC.

@huggo

• Into the Linux kernel code supplied by Mikrotik, I haven't found references to "sxtg5p_devices" structure shown into "platform.c". I assume it is in some code which is not "open source"?
  So I can't deduce the configuration of the SoC from that code?

The tricky part is working out what they refer to it (in source) as. You should be able to find this from the SPI NOR hard_config data type 0x17 (board_type in prom.c): https://github.com/john-tho/linux/blob/708fc99a000d4a7fef9fa0e19caf857f2634caf0/arch/mips/rb/prom.c We know is has G (gigabit ethernet), SPI touch screen controller (voltage), buzzer, NOR. https://github.com/john-tho/linux/blob/708fc99a000d4a7fef9fa0e19caf857f2634caf0/arch/mips/rb/platform.c The way they bundle devices together with hardware options to enable/disable parts also complicates thing.

@huggo

• I saw in the forum some have succeed to get a root shell on RouterOS. If I can get this access, would it be possible to read the SoC registers in order to show the configuration?

@johnth

On old RouterOS versions (downgrade), you can use exploits to enable the devel login, and scp busybox on to the device for tools:

• Up until RouterOS 6.43.14: https://github.com/tenable/routeros/tree/master/cleaner_wrasse
• Up until 6.44.3 with a USB port: https://github.com/0ki/mikrotik-tools
• Or modify an initramfs and netboot that

I used this on a hapac to dump SoC registers (busybox devmem).