[Libre-soc-dev] mp3 changes

[Luke Kenneth Casson Leighton]

okaaay running qemu is horribly slow: literally one instruction per second,
however!
deep joy! discrepancy found!
https://ftp.libre-soc.org/nohup.out

it looks like memcpy_3 is having difficulties loading from address
0x4020000,

now, this could just be because i have the parameters completely
wrong i'll re-run it and see, with the (reverted) values for regfiles.

l.