Yes, I added some additional code to Mickey's to complete the patch for
the hx4700. Yes, it was a hack, and not something intended for
submission. But, it works for us.
The real fix is a bigger controversy than most of us have time for
discussing right now. :-(
Nathan M wrote:
>I am writing in regards to Mickeyl's pxa-serial/8250-serial
>IRQ/namespace conflict patch (pxa-serial-hack.patch) and a had a
>couple questions. I am attempting to fix this conflict on an embedded
>system I have (not the hx4700, but suffers from the same issue). My
>hardware configuration includes 3 serial ports driven by the PXA
>driver as well as as a PCMCIA modem with an 8250 UART. Due to the
>namespace conflict I get the following error when
>trying to insmod Russell King's 8250.ko module:
>
>===code===============================
>[root_at_ARMCore pcmcia]$ insmod 8250.ko
>insmod: error inserting '8250.ko': -1 Device or resource busy
>======================================
>
>I took a look at the source for the patch and it looks like it would
>resolve the issue if I use it. However, I asked Russell King and he
>suggested that the patch would cause more problems than it fixes? Do
>his claims sound true?
>
>The following is a copy of my message to him (>) and Russell's reply (>>):
>
>===FWD============================================
>
>
>>>Something like the following [pxa-serial-hack.patch] to be added to
>>>
>>>
>8250.c >> would prevent a musical chairs issue with /dev/ttyS0 -
>/dev/ttyS2?:
>
>
>>Wrong. It's complete crap. It may look like it solves the problem
>>but it just papers over the problem.
>>
>>For example, using console=ttyS0 vs console=ttyS3 does not do what's
>>expected - there's no guarantee that one or other driver will end up
>>being the console.
>>
>>
>>
>>>From what you say, it sounds like this modification shouldn't have
>>>been necessary if the PXA team had followed the standards, however it
>>>looks like my issue could be resolved if I made these mods [used the
>>>patch]? You're thoughts, suggestions?
>>>
>>>
>>Due to the above, re-using the namespace is just not on for mainline
>>kernels. Sorry.
>>
>>
>===================================================
>
>Any thought's or suggestions are greatly appreciated.
>
>Thanks.
>
>-Nathan
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>
>
>
>
Received on Mon Aug 08 2005 - 11:14:59 EDT
This archive was generated by hypermail 2.2.0 : Mon Aug 08 2005 - 11:15:05 EDT