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term/ns8250: Use ACPI SPCR table when available to configure serial

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"serial auto" is now equivalent to just "serial" and will use the
SPCR to discover the port if present, otherwise defaults to "com0"
as before.

This allows to support MMIO ports specified by ACPI which is needed
on AWS EC2 "metal" instances, and will enable GRUB to pickup the
port configuration specified by ACPI in other cases.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Benjamin Herrenschmidt authored and Daniel Kiper committed 2023-01-19 17:39:03 +01:00
1 parent c2ef140a68
commit 7b192ec4cd
5 files changed
+117 -5
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include/grub/serial.h
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@@ -185,6 +185,7 @@ grub_serial_config_defaults (struct grub_serial_port *port)
#if defined(__mips__) || defined (__i386__) || defined (__x86_64__)
void grub_ns8250_init (void);
char *grub_ns8250_spcr_init (void);
char *grub_serial_ns8250_add_port (grub_port_t port, struct grub_serial_config *config);
char *grub_serial_ns8250_add_mmio (grub_addr_t addr, struct grub_serial_config *config);
#endif