On Sat, 2007-04-07 at 07:21 +0300, Mikhail Zolotaryov wrote:
> On PPC4xx embedded we often have UART0 on IRQ0 but 8250 UART driver
> uses IRQ0 as "no irq" hack. It's suggested that platforms with UART
> on IRQ0 will redefine is_real_interrupt(irq) macro but 8250 code
> anyway overrides that. As the result, serial line on UART0 works
> on polling-way and we have character loss on high baud rates.
>
> In patch I added check if UART0 is on IRQ0, if so we define
> is_real_interrupt macro to be 1 (true). Also, check if
> is_real_interrupt macro is already defined added to 8250 UART
> driver.
This is an old problem. The proper fix is already implemented for
arch/powerpc and consist of having virtual irq numbers (which helps for
many other things anyway).
Support for 4xx platforms in arch/powerpc is starting to get in, pop on
[email protected] where the patches are being posted and you are
welcome to give a hand porting more platforms over :-)
Ben.
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