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Document UART memmap offset #22

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29 changes: 17 additions & 12 deletions README.md
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Expand Up @@ -337,21 +337,26 @@ console with no other graphics or networking running.

#### Hardware Support

| Codename | Type-C Port | Commandline parameter | Function | Flipped? | BIOS Ver |
|-----------|--------------|---------------------------|----------|----------|----------|
| Dogwood | Top Back | `console=ttyS4,115200` | Full TTY | No | 3.00+ |
| Lotus | Middle Right | | | | N/A |
| Tulip | Middle Right | `console=ttyS4,115200` | Full TTY | Yes | 3.00+ |
| Lilac | Back Left | `console=ttyS4,115200` | Full TTY | No | 3.00+ |
| Azalea | Front Right | | | | N/A |
| TGL | N/A | | | | |
| ADL/Iris | Back Left | `console=ttyS0,115200n8` | | | N/A |
| Marigold | Front Right | `console=ttyS0,115200n8` | | No | N/A |
| Sakura | Front Right | `console=ttyS0,115200n8` | Full TTY | No | 3.00+ |
| Sunflower | Front Right | `console=uart,0xfe03e000` | Log only | No | 3.00+ |
| Codename | Type-C Port | Commandline parameter | Function | Flipped? | BIOS Ver | Memmap |
|-----------|--------------|---------------------------|----------|----------|----------|--------------|
| Dogwood | Top Back | `console=ttyS4,115200` | Full TTY | No | 3.00+ | |
| Lotus | Middle Right | | | | N/A | |
| Tulip | Middle Right | `console=ttyS4,115200` | Full TTY | Yes | 3.00+ | |
| Lilac | Back Left | `console=ttyS4,115200` | Full TTY | No | 3.00+ | |
| Azalea | Front Right | | | | N/A | |
| TGL | N/A | | | | | `0xfe03e000` |
| ADL/Iris | Back Left | `console=ttyS0,115200n8` | | | N/A | `0xfe03e000` |
| Marigold | Front Right | `console=ttyS0,115200n8` | | No | N/A | `0xfe036000` |
| Sakura | Front Right | `console=ttyS0,115200n8` | Full TTY | No | 3.00+ | `0xfe02c000` |
| Sunflower | Front Right | `console=uart,0xfe03e000` | Log only | No | 3.00+ | `0xfe03e000` |

ADL, Iris, Azalea, Lotus, Marigold have support in hardware but the BIOS does not expose it to the OS.

Some platforms have it enabled in BIOS and exposed through ACPI to the OS,
meaning no detailed configuration is necessary, just telling the OS to use e.g.
`ttyS0`. Other platforms, e.g. Sunflower, need custom configuration to tell the
OS about the memory map offset.

### BIOS

The BIOS settings can be managed through the CPU UART console by enabling
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