Re: ST16C554 Serial device driver

[Eric Valette <eric.valette@free.fr>]

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Russell King wrote:
> On Tue, Sep 21, 2004 at 12:40:08PM +0200, Eric Valette wrote:
> 
>>Sorry to annoy you with one small question : I'm currently working as a
>>contractor to port an application from LynxOS to linux 2.6 and I'm
>>annoyed with the serial driver code. I need to find a driver for a 
>>ST16C554 quad serial ISA board. I've tried to use setserial with the 
>>relevant IO ports and irq but cannot manage to output annything on the 
>>PC 104 board.
> 
> 
> The kernel 8250 driver is expected to drive this port.
> 
> What is the result of an autodetect at the correct address?  What are
> the commands you're issuing to tell the kernel where this port is?
> Do you get any kernel messages, and what are they?
> 

I checked the LynOS working driver code and found the following
driver uart configuration code (support two differents boards with
diffrent IO ranges and irq's) :

ERIMSERIAL(erimserial0, 0x287, 32 + 10, B19200, B19200,
         0x280, 0x288, 0x290, 0x298);

It means : IRQ 10, baud rate 1920 ioports : 0x280, 0x288, 0x290, 0x298
but the interesting register is the 0x287 that is used to

ERIMSERIAL(erimserial1, 0x2a7, 32 + 11, B19200, B19200,
         0x2a0, 0x2a8, 0x2b0, 0x2b8);

It means : IRQ 11, aud rate 1920 ioports : 0x2a0, 0x2a8, 0x2b0, 0x2b8

What is more suspect is the 0x287 (0x2a7) and register address that is 
described in the manufacturer documentation of the PC104 board that says 
: "When the same IRQ is shared by the 4 ports, the card uses 2 registers 
at 287H, one to valid the interrupts and the other to read back the 4 
interrupt status". The attached pictures gives the signification of the 
register.

regarding configuration I basically said :
	setserial /dev/ttyS2 port 0x280 irq 10 autoconfig

(same with the four ports) and

	setserial /dev/ttyS6 port 0x2a0 irq 11 autoconfig

(same with the four ports)

Kernel release = 2.6.9-rc2

Thanks for ansering

-- 
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Tel: +33 (0)2 99 85 26 76	Fax: +33 (0)2 99 85 26 76
E-mail: eric.valette@free.fr


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