mips: several issues

[kaspar030]

Apart from the issues in #6588, there are some more:

• the mips CPU makefiles have quite a lot of code duplication
• the mips flash targets are empty. They should fail and explain why ("No flash tool available. See https://..." ...).
  • pic32-wifire pic32-wifire: add support for flashing with pic32prog #9259
  • pic32-clicker
  • mips-malta => support dropped
• the mips board wiki-pages lack information on how to flash.

[neiljay]

@kaspar030 (and everyone else),

I will attempt to address these issue, but it may take a couple of weeks, things are very busy at the moment, In case you had not heard:

https://www.electronicsweekly.com/news/business/imagination-press-ahead-mips-sale-us-group-tallwood-2017-09/

Neil

[cladmi]

This PR fixed some of the code duplication in the makefiles: #8032
Some more cleanup can be done by making mips_pic32_common depend on mips32r2_common which would depend on mips.inc.mk.

[jnohlgard]

Some more issues popped up:

• The MIPS CPUs never call the common periph_init during boot as far as I can tell.
• The MIPS CPUs do not have a cpu_init function which is called by the board_init to initialize things in the CPU, (this function in the other CPUs is sometimes very simple with only a call to periph_init)

[neiljay]

item 2 now resolved in #9259. I think this can be closed ?

[cladmi]

It is only flashing pic32-wifire and not pic32-clicker, also it is currently not merged :)
But we are getting closer to closing this.