Ignore blob of image data from language stats

Add README

Add software side

Only change mode if bit 3 is set

Increase IMEM and DMEM sizes

Enable icache, small IPB bump, disable wishbone pipelined mode

Bus addresses are byte addresses, not word

Use SRAM instead

First pass on SDRAM access (ack signal doesn't get sent, proper values show up but only after a timeout)

Fix wrong cpu freq definition

Move sources to src directory

Implement sum_abs mode, replacing none; lower PLL out to 95MHz

hours wasted: 1

Fix shell.nix, add interpreter lines to Makefile

Update frequency to new value