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Date: Fri, 11 May 2007 11:17:33 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-core] 16550A driver and Moxa card / solved
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To: Maksym Veremeyenko <verem@domain.hid>
Cc: xenomai@xenomai.org

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Maksym Veremeyenko wrote:
> CHABAL David =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
>=20
>> I met some trouble with the 16550A driver provided in Xenomai 2.3.1
>> and my Moxa cards (PCI / 8 * RS232 / 168U ).
>>
>> It was a problem of baudrate computation before setting the LCR_DLAB
>> register.
>>
>> The formula implemented by the Xenomai driver is different from the on=
e
>> provided by Moxa. So I copy/paste the formula from the mxser.c file
>> (present in the
>> kernel distro), and it seems to work fine.
>>
>> I think it's Moxa card dependant, may be caused by the high default ba=
ud
>> rate of this card.
>=20
> I have two Moxa boards with no problem, possible you need to specify=20
> 'baud_base' param.
>=20
> I my case :
>=20
> # 8 ports board:
> /sbin/modprobe xeno_16550A \
> ioaddr=3D0x1000,0x1008,0x1010,0x1018,0x1020,0x1028,0x1030,0x1038 \
> irq=3D9,9,9,9,9,9,9,9 \
> baud_base=3D921600,921600,921600,921600,921600,921600,921600,921600
>=20
> # 2 ports board + onboards:
> /sbin/modprobe xeno_16550A ioaddr=3D0x3f8,0x2f8,0xdf00,0xdf08=20
> irq=3D4,3,11,11 baud_base=3D115200,115200,921600,921600
>=20

Interesting. That would leave us just with the generic fix to catch
baud_rate=3D=3D0. Far more attractive. :)

David, can you confirm this? Weren't you just aware of the baud_base
parameter?

Jan


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