mirror of
https://github.com/ipxe/ipxe
synced 2025-12-07 09:50:26 +03:00
71b4bfb6b2
16550 UARTs exist on non-x86 platforms but will be accessible via MMIO rather than port I/O. It is possible to encounter MMIO-mapped 16550 UARTs on x86 platforms, but there is no real requirement to support them in iPXE since the standard COM1, COM2, etc ports have been present on every PC-compatible machine since 1981. Assume for now that accessing 16550 UART registers requires inb()/outb() on x86 and readb()/writeb() on other architectures. Allow for the existence of a register shift on MMIO-mapped 16550 UARTs, since modern SoCs tend to treat register addresses as being aligned to either 32-bit or 64-bit boundaries. Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org