circuitpython

Commit Graph

Author	SHA1	Message	Date
Sean Cross	2f95cc95a4	litex: move more critical code to RAM The XIP SPI flash on Fomu is slow, which results in certain operations taking a long time. This becomes a problem for time-critical operations such as USB. Move various calls into RAM to improve performance. This includes the call to __modsi3 and __udivsi3 which are used by the supervisor handler to determine if periodic callbacks need to be run. This finishes fixing #3841 Signed-off-by: Sean Cross <sean@xobs.io>	2020-12-24 14:06:57 +08:00
Jeff Epler	7f0f0b30d3	linker scripts: Re-align at ":" With "git show -b" you can verify that this is a whitespace only change because the diff will be empty.	2020-04-27 17:17:42 -05:00
Jeff Epler	6f6dc835d2	litex: Use FLASH_FIRMWARE instead of FLASH in linker scripts for compatibility with the build_memory_info script	2020-04-27 09:12:45 -05:00
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

6 Commits