tools/litex_server: Add DevMem (/dev/mem) interface - #2497
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Add CommDevMem, a mmap-based /dev/mem backend for litex_server, for LiteX SoCs directly memory-mapped from a Hard CPU running Linux (ex Zynq7000's GP0 at 0x40000000 or Cyclone V HPS's H2F LW bridge at 0xff200000). Running litex_server --devmem on the Hard CPU then allows remote litex_cli/litescope accesses: litex_server --devmem [--devmem-base 0xff200000] [--devmem-size 0x200000] Addresses are physical addresses; base/size define the mmap'ed window (defaults match the Cyclone V HPS H2F LW bridge).
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Add
CommDevMem, a mmap-based/dev/membackend forlitex_server, for LiteX SoCs directly memory-mapped from a Hard CPU running Linux (ex Zynq7000's GP0 at0x4000_0000or Cyclone V HPS's H2F LW bridge at0xff20_0000, see #2496).Running
litex_server --devmemon the Hard CPU then allows remotelitex_cli/litescope accesses over the network:Addresses are physical addresses; base/size define the mmap'ed window (defaults match the Cyclone V HPS H2F LW bridge). Modeled on
CommPCIe(same mmap/ctypes access pattern), with a window check on accesses.Functionally tested against a regular file through the
devparameter (write/read/burst/window-check); on-target test on a MiSTer/DE10-Nano is the next step together with the Cyclone V HPS bring-up.