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[PATCH] PCDP: handle tables that don't supply baud rate

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The HCDP specs (i.e., PCDP revision < 3) allow zero as a default value for
baud rate and data bits.  So if firmware doesn't supply them, let
early_serial_console_init() probe for them rather than telling it the baud
rate is zero.

Also, update the URL for the PCDP spec.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Bjorn Helgaas 2005-06-23 00:10:16 -07:00 committed by Linus Torvalds
parent bb93e3a52f
commit 280dedb8d6
2 changed files with 8 additions and 5 deletions
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11
drivers/firmware/pcdp.c
View file

@ -23,12 +23,15 @@ setup_serial_console(struct pcdp_uart *uart)
{
#ifdef CONFIG_SERIAL_8250_CONSOLE
int mmio;
static char options[64];
static char options[64], *p = options;
mmio = (uart->addr.address_space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY);
snprintf(options, sizeof(options), "console=uart,%s,0x%lx,%lun%d",
mmio ? "mmio" : "io", uart->addr.address, uart->baud,
uart->bits ? uart->bits : 8);
p += sprintf(p, "console=uart,%s,0x%lx",
mmio ? "mmio" : "io", uart->addr.address);
if (uart->baud)
p += sprintf(p, ",%lu", uart->baud);
if (uart->bits)
p += sprintf(p, "n%d", uart->bits);
return early_serial_console_init(options);
#else

2
drivers/firmware/pcdp.h
View file

@ -2,7 +2,7 @@
* Definitions for PCDP-defined console devices
*
* v1.0a: http://www.dig64.org/specifications/DIG64_HCDPv10a_01.pdf
* v2.0: http://www.dig64.org/specifications/DIG64_HCDPv20_042804.pdf
* v2.0: http://www.dig64.org/specifications/DIG64_PCDPv20.pdf
*
* (c) Copyright 2002, 2004 Hewlett-Packard Development Company, L.P.
* Khalid Aziz <khalid.aziz@hp.com>