Messages in this thread | | | From | Kumar Gala <> | Subject | Re: [RFC] suggested fix for 83xx/85xx PowerPC UART break bug | Date | Thu, 31 Jul 2008 15:31:43 -0500 |
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On Jul 31, 2008, at 10:26 AM, Paul Gortmaker wrote:
> > This is something I'd tripped over earlier, and wanted to follow up on > to get an acceptable fix in for everyone's benefit before it falls > through > the cracks again. > > There seems to be an issue with recent 83xx/85xx SOC UARTs, in which > a break > triggers a short lived IRQ storm (hence killing any hope of using > SysRQ). > The only fix I found to work was to just ignore the bogus events that > had the associated signature bit set. > > This fix is what I was using against earlier kernels, but I hate to > add more > board/arch specific ifdefs to files like 8250.c, so I'm wondering if > anyone has any other suggestions before I simply end up cleaning up > the > boardlist (now ppc is dead) and respinning the patch much as it is now > and resending.
How did you test this or generate it? I was thinking about this the other day and figured we need to try and track this down with the HW guys. If we can generate a simple test I can try and run it through the various boards/parts we have and see which ones show the issue and which dont.
- k
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