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term/ns8250-spcr: Continue processing SPCR table even if revision is < 2

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According to commit 0231d00082 (ACPI: SPCR: Make SPCR available to x86)
to the Linux kernel, "On x86, many systems have a valid SPCR table but the
table version is not 2 so the table version check must be a warning."

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Glenn Washburn 2023-07-26 16:02:36 -05:00 committed by Daniel Kiper
parent 711e034235
commit b0890d371c
1 changed files with 3 additions and 1 deletions
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4
grub-core/term/ns8250-spcr.c
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@ -18,6 +18,7 @@
#if !defined(GRUB_MACHINE_IEEE1275) && !defined(GRUB_MACHINE_QEMU)
#include <grub/misc.h>
#include <grub/serial.h>
#include <grub/ns8250.h>
#include <grub/types.h>
@ -34,7 +35,8 @@ grub_ns8250_spcr_init (void)
if (spcr == NULL)
return NULL;
if (spcr->hdr.revision < 2)
return NULL;
grub_dprintf ("serial", "SPCR table revision %d < 2, continuing anyway\n",
(int) spcr->hdr.revision);
if (spcr->intf_type != GRUB_ACPI_SPCR_INTF_TYPE_16550 &&
spcr->intf_type != GRUB_ACPI_SPCR_INTF_TYPE_16550X)
return NULL;