* [ECOS] One urgent questions regarding to MMU, help wanted!
@ 2000-09-08 10:29 Ling Su
2000-09-10 19:41 ` Jonathan Larmour
0 siblings, 1 reply; 2+ messages in thread
From: Ling Su @ 2000-09-08 10:29 UTC (permalink / raw)
To: ecos-discuss
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 392 bytes --]
Hello,
Â
I have one specific question on MMU in eCos. My understanding is currently
in eCos there is no MMU support, so is there any concept of "Virtual memory
address"? Actually my question comes from the PCI memory space allocation, is
there any diference between the CPU seeing address and base_register setting for
the PCI bus? Thanks for any hints!
Â
Best Regards,
-Ling
Â
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [ECOS] One urgent questions regarding to MMU, help wanted!
2000-09-08 10:29 [ECOS] One urgent questions regarding to MMU, help wanted! Ling Su
@ 2000-09-10 19:41 ` Jonathan Larmour
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Larmour @ 2000-09-10 19:41 UTC (permalink / raw)
To: Ling Su; +Cc: ecos-discuss
> Ling Su wrote:
>
> Hello,
>
> I have one specific question on MMU in eCos. My understanding is
> currently in eCos there is no MMU support, so is there any concept of
> "Virtual memory address"? Actually my question comes from the PCI memory
> space allocation, is there any diference between the CPU seeing address
> and base_register setting for the PCI bus? Thanks for any hints!
Look in <cyg/hal/plf_io.h>. For the vrc4373, you will see:
// This is where the PCI spaces are mapped in the CPU's (virtual)
// address space.
#define HAL_PCI_PHYSICAL_MEMORY_BASE 0xC0000000
#define HAL_PCI_PHYSICAL_IO_BASE 0xAC000000
And in the PCI library, in pci.c, when I/O or memory resources are
allocated, each memory/io region is just allocated sequentially on top of
the above addresses. I believe :-).
Jifl
--
Red Hat, 35 Cambridge Place, Cambridge, UK. CB2 1NS Tel: +44 (1223) 728762
"Plan to be spontaneous tomorrow." || These opinions are all my own fault
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2000-09-10 19:41 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2000-09-08 10:29 [ECOS] One urgent questions regarding to MMU, help wanted! Ling Su
2000-09-10 19:41 ` Jonathan Larmour
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).