In article <[email protected]>,
Andrew Morton <[email protected]> wrote:
>Greg Edwards <[email protected]> wrote:
>>
>> According to include/linux/console.h, CON_CONSDEV flag should be set on
>> the last console specified on the boot command line:
>>
>> 86 #define CON_PRINTBUFFER (1)
>> 87 #define CON_CONSDEV (2) /* Last on the command line */
>> 88 #define CON_ENABLED (4)
>> 89 #define CON_BOOT (8)
>>
>> This does not currently happen if there is more than one console specified
>> on the boot commandline. Instead, it gets set on the first console on the
>> command line. This can cause problems for things like kdb that look for
>> the CON_CONSDEV flag to see if the console is valid.
>>
>> Additionaly, it doesn't look like CON_CONSDEV is reassigned to the next
>> preferred console at unregister time if the console being unregistered
>> currently has that bit set.
>>
>> Example (from sn2 ia64):
>>
>> elilo vmlinuz root=<dev> console=ttyS0 console=ttySG0
>>
>> in this case, the flags on ttySG console struct will be 0x4 (should be
>> 0x6).
>>
>> Attached patch against bk fixes both issues for the cases I looked at. It
>> uses selected_console (which gets incremented for each console specified
>> on the command line) as the indicator of which console to set CON_CONSDEV
>> on. When adding the console to the list, if the previous one had
>> CON_CONSDEV set, it masks it out. Tested on ia64 and x86.
>
>The `console=a console=b' behaviour seem basically random to me :(. And it
>gets re-randomised on a regular basis.
Well, on the other hand the last registered console is the one
that connects to /dev/console and that has never changed afaik
(and it shouldn't, many setups rely on it).
Mike.
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