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fix(host): Build CONFIG_SERIAL_8250_PCI as module on aarch64 - #284
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Xen on Graviton4 metal takes ownership of the PCI 8250/16550 UART that EC2 provides, but still exposes it to dom0. The dom0 kernel then tries to probe the device and panics. Until we have a proper fix in place on the Xen side, change the driver for this UART to be built as a module, which gives us a way to remove it when we install Edera under Xen on aarch64. The driver is still needed for Edera on KVM, so we cannot disable it entirely. Part-of: https://linear.app/edera/issue/COR-99 Signed-off-by: Simon Veith <simon@edera.dev>
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Xen on Graviton4 metal takes ownership of the PCI 8250/16550 UART that
EC2 provides, but still exposes it to dom0. The dom0 kernel then tries
to probe the device and panics.
Until we have a proper fix in place on the Xen side, change the driver
for this UART to be built as a module, which gives us a way to remove
it when we install Edera under Xen on aarch64.
The driver is still needed for Edera on KVM, so we cannot disable it
entirely.
Part-of: https://linear.app/edera/issue/COR-99
Signed-off-by: Simon Veith simon@edera.dev