Messages in this thread | | | From | Bjorn Helgaas <> | Subject | Re: [RFC][PATCH] Way for platforms to alter built-in serial ports | Date | Wed, 6 Oct 2004 13:47:57 -0600 |
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On Wednesday 06 October 2004 1:29 am, Russell King wrote: > On Thu, Sep 30, 2004 at 10:14:00AM -0600, Bjorn Helgaas wrote: > > This looks like a reasonable short-term fix, but I think the whole > > serial8250_isa_init_ports() should go away. I like dwmw2's suggestion > > of an 8250_platform.c that could use register_serial() for each port > > in some platform-supplied old_serial_port[] table, which is probably > > what you mean by moving to a more dynamic allocation. > > The only reason it exists in its current form is because Alan says > we can't get rid of the serial port initialisation due to the x86 > requirement for serial console to be initialised reasonably early. > > Unfortunately the early console stuff (afaik) never made it in to > the kernel, so we've had to keep this hanging around.
My "console=uart" patch http://www.ussg.iu.edu/hypermail/linux/kernel/0409.1/1034.html is a start, I think. Relative to the current situation, it - requires different syntax ("console=uart" vs "console=ttyS0"), though a platform could choose to translate "console=ttyS0" into "console=uart,io,0x3f8" - can start working much earlier (no interrupts or clock calibration required) - doesn't deal with all the wierd devices the full driver does - transitions automatically to the matching ttyS device after the driver is initialized - 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/
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