RE: serial driver question

[Ed Vance]

Guennadi Liakhovetski wrote:
> Hello all
> 
> The function
> static int size_fifo(struct async_struct *info)
> {
> ...
> ends as follows:
> 	serial_outp(info, UART_LCR, UART_LCR_DLAB);
> 	serial_outp(info, UART_DLL, old_dll);
> 	serial_outp(info, UART_DLM, old_dlm);
> 
> 	return count;
> }
> 
> Which means, that DLAB is not re-set, and, in particular, all 
> subsequent read/write operations on offsets 0 and 1 will not 
> affect the data and interrupt enable registers, but the divisor 
> latch register... Or is this register somehow magically restored 
> elsewhere or by the hardware (say, on an interrupt)? This 
> function seems to be only called for startech UARTs.

Hi Guennadi,

I'll look at it as soon as my system is up. It's morning boot-up time here.
Have a good evening.

Ed Vance

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