[syslinux] BTW, serial 0
Bjørn Mork
bjorn at mork.no
Wed Aug 11 11:13:03 PDT 2010
Geert Stappers <stappers at stappers.nl> writes:
> Op 20100811 om 18:54 schreef Bjørn Mork:
>> Gene Cumm <gene.cumm at gmail.com> writes:
>>
>> >
>> > Since you absolutely require the serial console options, your best bet
>> > is probably to remaster the discs and alter the configuration files
>> > that are used to include these options.
>>
>> BTW, is there ever a reason *not* to put "serial 0" into a syslinux
>> configuration?
>
> The answer is another question:
>
> What should do Syslinux
> when there is no serial port (at the default address) ?
I would hope for nothing extra-ordinary. I.e. the same as it would do
without the serial statement. And I believe it does.
I do in fact boot my laptop with "serial 0" (trying to standardize my
extlinux.conf files on different systems), and this laptop does not have
any serial ports. Not even a hidden one. This is /proc/ioports:
0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-0060 : keyboard
0064-0064 : keyboard
0070-0071 : rtc0
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
03c0-03df : vga+
0800-080f : pnp 00:02
0cf8-0cff : PCI conf1
1000-107f : pnp 00:02
1000-1003 : ACPI PM1a_EVT_BLK
1004-1005 : ACPI PM1a_CNT_BLK
1008-100b : ACPI PM_TMR
1010-1015 : ACPI CPU throttle
1020-102f : ACPI GPE0_BLK
1050-1050 : ACPI PM2_CNT_BLK
1180-11ff : pnp 00:02
15e0-15ef : pnp 00:02
1600-167f : pnp 00:02
1680-169f : pnp 00:02
1800-1807 : 0000:00:02.0
1838-183b : 0000:00:1f.2
1838-183b : ahci
183c-183f : 0000:00:1f.2
183c-183f : ahci
1840-185f : 0000:00:19.0
1860-187f : 0000:00:1a.0
1860-187f : uhci_hcd
1880-189f : 0000:00:1a.1
1880-189f : uhci_hcd
18a0-18bf : 0000:00:1a.2
18a0-18bf : uhci_hcd
18c0-18df : 0000:00:1d.0
18c0-18df : uhci_hcd
18e0-18ff : 0000:00:1d.1
18e0-18ff : uhci_hcd
1c00-1c1f : 0000:00:1d.2
1c00-1c1f : uhci_hcd
1c20-1c3f : 0000:00:1f.2
1c20-1c3f : ahci
1c40-1c47 : 0000:00:1f.2
1c40-1c47 : ahci
1c48-1c4f : 0000:00:1f.2
1c48-1c4f : ahci
1c60-1c7f : 0000:00:1f.3
1c60-1c7f : i801_smbus
2000-2fff : PCI Bus 0000:02
3000-3fff : PCI Bus 0000:03
AFAICS, adding "serial 0" gives the benefit of working on serial console
systems without changing anything noticable for other systems. But I
was asking because I'm afraid I'm missing something.
Like the reason why Debian is so reluctant to include "serial 0" in
their default iso/pxe installation images. I guess there must be a
reason...
Bjørn
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