[U-Boot-Users] [PATCH][RFC] pci: Remove CONFIG_PCI_SKIP_HOST_BRIDGE and Add check PCI class of host bridge

[Larry Johnson <lrj@acm.org>]

Anton Vorontsov wrote:
> On Mon, May 05, 2008 at 08:41:59PM +0200, Stefan Roese wrote:
>> On Monday 05 May 2008, Larry Johnson wrote:
>>>>> Yes, I totally agree. Patches should *not* change the default behavior.
>>>>> We should change it as you suggested. Sorry, I must have missed this.
>>>>>
>>>>> Nobuhiro, could you please send a new patch to fix this problem?
>>>> Thank you for your check.
>>>> It has troubled you with my patch.
>>>>
>>>> I rewirte new patch . Could you please check this patch and confirming
>>>> the work?
>>>>
>>>> Best regards,
>>>>  Nobuhiro
>>> Hi Nobuhiro, Stefan, and everyone,
>>>
>>> Sorry for the delay in getting back to you.  My mail reader thinks your
>>> patch is part of your signature, so I missed it the first time around.
>>>
>>> I did a quick check using the Sequoia board, and it looks like the patch
>>> isn't working there.  U-Boot is reporting the class of the bridge as
>>> "0680", which I assume is why the patch doesn't skip it.
>> Yes, I just gave the new patch a try and noticed (still) a problem on Sequoia. 
>> The PCI host bridge (PPC) is listed upon bootup which was not the case with 
>> the U-Boot version prior to the first patch.
>>
>>> Nobuhiro and Stefan, do you think we can get a working fix for this into
>>> 1.3.3 (even if it is not the final fix)?
>> I definitely hope so. Even though I will probably not find the time to submit 
>> a patch to really fix this problem till the scheduled release date. But I 
>> will gladly test a patch. :)
>>
>>> If not, we should patch 
>>> Sequoia and Korat to add CONFIG_PCI_SKIP_HOST_BRIDGE so they won't be
>>> broken in that release.
>> Or perhaps we should revert the first patch and give it another try in the 
>> next merge-window when/if a new patch is available.
> 
> Yes, please. That patch also broke probably all Freescale PowerPC boards.
> Particularly, without #define CONFIG_PCI_SKIP_HOST_BRIDGE I'm getting
> these errors from the Linux using PCI 3com driver:
> 
> eth4: Host error, FIFO diagnostic register 0000.
> eth4: PCI bus error, bus status 80000020
> eth4:  setting full-duplex.
> [infinite times]
> 
> This is MPC8315E-RDB.

At this point, I'm in favor of reverting the patch for this release and 
letting Nobuhiro put in a temporary board-specific patch for those 
boards that need the modified functionality.

The if we do a non-board-specific patch for the next window, we won't be 
rushed to make sure it doesn't break any boards.

Best regards,
Larry