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[uart] Allow for the existence of non-16550 UARTs

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Remove the assumption that all platforms use a fixed number of 16550
UARTs identifiable by a simple numeric index.  Create an abstraction
allowing for dynamic instantiation and registration of any number of
arbitrary UART models.

The common case of the serial console on x86 uses a single fixed UART
specified at compile time.  Avoid unnecessarily dragging in the
dynamic instantiation code in this use case by allowing COMCONSOLE to
refer to a single static UART object representing the relevant port.

When selecting a UART by command-line argument (as used in the
"gdbstub serial <port>" command), allow the UART to be specified as
either a numeric index (to retain backwards compatiblity) or a
case-insensitive port name such as "COM2".

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-06-17 14:28:18 +01:00
parent 60e167c00b
commit 6c8fb4b89d
15 changed files with 689 additions and 320 deletions
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src/Makefile
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@@ -94,6 +94,7 @@ SRCDIRS += drivers/infiniband/mlx_utils/mlx_lib/mlx_link_speed
SRCDIRS += drivers/infiniband/mlx_utils/mlx_lib/mlx_mtu
SRCDIRS += drivers/infiniband/mlx_nodnic/src
SRCDIRS += drivers/usb
SRCDIRS += drivers/uart
SRCDIRS += interface/pxe interface/efi interface/smbios
SRCDIRS += interface/bofm
SRCDIRS += interface/xen