Re: [ts-7000] Accessing serial ports on pc104 expansion board with TS7800

[Bill Whiteley <>]

Thanks for the reply. Ok, so does this mean that the low irq on my expansion board maps to a higher 
irq on the arm9 (if so where do I find the mapping), or do I need to set my expansion
board to have a irq of 70? If it is the latter, the gps may just not be compatible. 

Thanks,

Bill

On Sat, Feb 7, 2009 at 5:40 PM, Jason Stahls <> wrote:

bill.whiteley wrote:
> :eclipse# setserial /dev/ttyS2 irq 7
>
> When I read and write to /dev/ttyS2 in my application it doesn't throw
> any errors. The read always returns 0 characters received and the
> write always returns the number of characters that I intended to send,
> however the tx and rx fields never change int /proc/tty/driver/serial:
>
> :eclipse# cat /proc/tty/driver/serial
> serinfo:1.0 driver revision:
> 0: uart:16550A mmio:0xF1012000 irq:3 tx:4658 rx:212 RTS|CTS|DTR|DSR|CD
> 1: uart:16550A mmio:0xF1012100 irq:4 tx:53 rx:0 RTS|DTR|DSR|CD
> 2: uart:XR16850 mmio:0xEE0003E8 irq:7 tx:0 rx:0 <-----HERE
>
> So I doubt that I am actually sending or receiving anything.
>
> Does any one have experience with getting serial ports to work on
> expansion boards or have any idea what I am missing??

Don't forget that this is ARM not x86 so IRQ70 is totally valid and may
not corrispond to the IRQ's set on a expansion board designed for a x86
CPU. Often lower x86 IRQ's from ISA/PCI busses will end up mapped to
much higher IRQ's on the actual ARM CPU.

Jason

-- 
Bill Whiteley

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