Add writable SPI flash and XMODEM xfer support #370
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…nly single build directory.
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This pull request re-enables SPI flash write support and adds support to the firmware to transfer a firmware image using the XMODEM protocol.
To use the feature, at the
H2Uprompt, type:The XMODEM functionality is provided by libmodem, a known-to-work full implementation of XMODEM (and possibly other serial protocols) designed to run anywhere a C89 compiler is present. Building
libmodemas a submodule has been integrated into the Makefile, and requires meson to compile. I hope to be able to add more targets forlibmodemwith HDMI2USB to facilitate code reuse.I have included a small Python script called
getcrc32.pyto calculate the crc and length for you, which can either be used in a script or copy/pasted to theH2Uprompt. I have also created a small shell script to automate firmware upload, provided you know the flash address. In theory, the entire flash, including bitstream, BIOS, and firmware could be rewritten from theH2Uprompt, but I have not tested this (and would need to extend the buffer size from 128kB to accommodate this).I have confirmed that loading a firmware image works on both the Mimasv2 and Opsis boards. I have not currently had luck getting firmware upload to work on
qemu-litex, but I can add it as a patch. Other than that, please let me know any changes you'd like me to make and we can discuss on IRC.