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3 Commits

Author SHA1 Message Date
Sean Cross 9845a064ad ports: fomu: move more functions into ram for stability 
The SPI flash on current Fomu firmware is slow.  Circuitpython runs
XIP from SPI flash, and so execution time can also be slow.  Ordinarily
this isn't a problem, however certain operations are time-sensitive.

In particular, USB function needs to be handled quickly in order to
prevent the host from re-enumerating the device.

Place several critical TinyUSB structures into RAM, as well as several
hot functions that are frequently called.  This reduces execution time
at the expense of system memory, and greatly improves system stability.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-04-02 11:21:22 +08:00
Sean Cross 065441e58c ports: litex: enable itcm region for fomu 
This adds a new command line flag -DFOMU to indicate we're building
for a Fomu board.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-31 09:40:38 +08:00
Sean Cross 786e79ebc9 ports: litex: add port and fomu board 
This adds support for Litex, along with support for the Fomu FPGA board.

Signed-off-by: Sean Cross <sean@xobs.io>
 2020-03-31 09:40:38 +08:00