Commit 3da34aa brakes MSI support on MPC8308 (possibly all MPC83xx) [REPOST]

Wolfgang Denk wd at
Fri Jul 30 07:20:43 EST 2010

Dear Kumar & Kim,

any comments on this issue?


In message <4C48B384.1020006 at> Ilya Yanok wrote:
>   Hi Kumar, Kim, Josh, everybody,
> I hope to disturb you but I haven't got any reply for my first posting...
> I've found that MSI work correctly with older kernels on my MPC8308RDB 
> board and don't work with newer ones. After bisecting I've found that 
> the source of the problem is commit 3da34aa:
> commit 3da34aae03d498ee62f75aa7467de93cce3030fd
> Author: Kumar Gala <galak at>
> Date:   Tue May 12 15:51:56 2009 -0500
>      powerpc/fsl: Support unique MSI addresses per PCIe Root Complex
>      Its feasible based on how the PCI address map is setup that the region
>      of PCI address space used for MSIs differs for each PHB on the same 
> SoC.
>      Instead of assuming that the address mappes to CCSRBAR 1:1 we read
>      PEXCSRBAR (BAR0) for the PHB that the given pci_dev is on.
>      Signed-off-by: Kumar Gala <galak at>
> I can see BAR0 initialization for 85xx/86xx hardware but not for 83xx 
> neigher in the kernel nor in U-Boot (that makes me think that all 83xx 
> can be affected).
> I'm not actually an PCI expert so I've just tried to write IMMR base 
> address to the BAR0 register from the U-Boot to get the correct address 
> but this doesn't help.
> Please direct me how to init 83xx PCIE controller to make it compatible 
> with this patch.
> Kim, I think MPC8315E is affected too, could you please test it?
> Thanks in advance.
> Regards, Ilya.

Best regards,

Wolfgang Denk

DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at
A good aphorism is too hard for the tooth of time, and  is  not  worn
away  by  all  the  centuries,  although  it serves as food for every
epoch.                                  - Friedrich Wilhelm Nietzsche
                          _Miscellaneous Maxims and Opinions_ no. 168

More information about the Linuxppc-dev mailing list