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e9a24cac11
This should really be more than one commit, but I wrote everything in one
shot and I don't feel like arranging the changes logically into different
commits. So, these are the changes:
- added WOFS (Write Once File System). This is a writeable file system that
exists in the MCU's internal Flash memory and allows files to be written,
but only once, in a single shot. More details to follow.
- the platform interface has a new MCU flash access interface.
- added WOFS "reference implementations" for two CPUs: LM3S8962 and
STM32F103RE. They are easily extendable to other CPUs in the same platform
and can be taken as a model for other platforms.
- the ROMFS file layout in memory was slightly changed.
- the simulator (src/platform/sim) got a new function (lseek).
- shell: now each shell command receives its arguments in a C-main-style
(argc, argv) pair. This was originally Marcelo's idea and it finally
made it to the master (although this particular implementation is mine),
after I got fed up with all the argument parsing in the shell functions.
- new shell command: wofmt ("formats" a WOFS, effectively clearing it).
- a couple of small fixes in the shell code