[syslinux] extlinux 6.03 serial console not responding to input

[Ferenc Wagner]

Gene Cumm <gene.cumm at gmail.com> writes:

> On Sun, May 17, 2015 at 2:06 PM, Ferenc Wagner via Syslinux <syslinux at zytor.com> wrote:
>
>> "Andrew J. Schorr via Syslinux" <syslinux at zytor.com> writes:
>>
>>> I just upgraded some systems from Fedora 19 (extlinux 4.05)
>>> to Fedora 21 (extlinux 6.03).  I am using IPMI 2.0 serial-over-lan
>>> console redirection.  Under the old version, this worked without
>>> any problem:
>>>
>>>    serial 0 57600 0x003
>>>    ui menu.c32
>>>    menu title ExtLinux Boot Menu
>>>    timeout 100
>>>
>>>    label Linux1
>>>    ...
>>>
>>> Using the new version of extlinux in Fedora 21, I can no longer communicate
>>> with the extlinux boot menu.  It does not see anything that I type.
>>> I tried grub2, and that works fine.
>>>
>>> I tried removing the flowcontrol flag bits, and I also tried 0x00b,
>>> but nothing works.
>>
>> I hit the same problem on Fujitsu Primergy CX250 S2 servers.  I ended up
>> relying on the BIOS console redirection instead of using the native
>> serial support in Syslinux.  It isn't a generic problem, though, as at
>> least virtual machines can receive serial input under 6.03.  Testing
>> intermediate versions would help finding the problem, but recently I
>> can't request much downtime on these servers.
>
> Feri, I presume you used a non-zero flow control flag on the Fujitsu
> system to get it to work properly in Syslinux-4.xx?

The flags were 0x13 when I upgraded to 6.03.  Probably because SoL did
not work properly otherwise, but I don't remember.  I will test using a
decimal value when I get to reboot one of these machines.
-- 
Regards,
Feri.