Re: [ECOS] How to access PCI memory(HELP)....

["Ling Su" <lingsu at palmmicro dot com>]

Jifl said,
>
> After another look I now see what's going on. Yes, there is a problem here
> I believe and some of my understanding before was wrong(!) The relevant
> stuff is in hal_memc_setup_table (a table-driven initialization thing
> driven by hal_memc_setup) in platform.S.
>
> In there, PCI_IOSPACE_BASE is set to 0x0c. This is used at the entry:
>
> # Map PCI IO space Phys == Local
> .long   PCIMSTRIO,      (0x000fd000 | ( PCI_IOSPACE_BASE << 24) |
> PCI_IOSPACE_BASE)
>
> So while the space is being mapped 1:1, it is indeed set up for 0x0C000000
> and not 0xC0000000, as you suggested.
>
> The fix may be just changing the definition of
> HAL_PCI_PHYSICAL_MEMORY_BASE in plf_io.h to 0x0C000000
>
> Give that a go and let us know if it worked.
>

Thanks, Jifl,

I think Nick said is correct, "PCI_IOSPACE_BASE only maps PCI device IO
registers, not memory
mappings ". I still try what you suggested, change the
HAL_PCI_PHYSICAL_MEMORY_BASE to 0x0C00_0000, unfortunately the is a SIGSEGV
signal, and a segment fault. I didn't dig the codes on the MMU part, and
don't know if the eCos actived TLB in VR4300, I have grabbed a copy of
vr4300 manual, hopefully I can find anything helpful.... but I don't know if
I could still catch up my project scedule...:) if you have any thing new to
update, kindly let me know, thanks a lot!

Best Regards,
-Ling