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Allow other image file names through cli args, increase ram size, update readme

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taitep
2025-12-21 17:49:02 +01:00
parent 25dd685345
commit c10e1ec09b
2 changed files with 19 additions and 6 deletions
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README.md
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@@ -8,12 +8,17 @@ potentially more. No plans for RV32I or RV32/64E.
Currently, the emulator is nowhere near complete,
its not even at rv64i, but it does work for a subset of it.
The emulator will load a raw binary image from the file `./img` into RAM,
which starts at 0x80000000 and is currently 1MiB,
The emulator will load a raw binary image from a file specified as a CLI argument into RAM,
which starts at 0x80000000 and is currently 16MiB,
and start execution at the start of the image/ram.
There is also a debug out page starting at `0x00000000`-`0x00001000`.
Anything written to it will be logged out in hex.
Currently there is no input, altho i might get around to making
an early UART kinda soon.
There is also a UART at `0x00001000`-`0x00002000`, the interface is quite simple:
- byte `0`: Data. When written, writes out the character
When read, reads a character from the buffer, or 0 if empty.
- byte `1`: Status. Read-only. Least significant bit is `TX_READY` and indicates whether
the UART is ready to be written to. Currently always 1.
Next least significant is `RX_READY`, indicates whether the read buffer
has any data to read.