Messages in this thread | | | From | Ed Vance <> | Subject | RE: serial driver question | Date | Fri, 12 Apr 2002 08:54:13 -0700 |
| |
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
---------------------------------------------------------------- Ed Vance edv@macrolink.com Macrolink, Inc. 1500 N. Kellogg Dr Anaheim, CA 92807 ----------------------------------------------------------------
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |