Dual-Port SRAM

Dual-Port SRAM

[Bob White]

I've got a board with a dual-port SRAM attached to the 440GP on the
peripheral bus (at CS1_N).  I can map the TLB and access the device
from the bdi2000 and the u-boot command prompt.

What configuration is necessary to map this memory into the kernel?
Can you point me to some examples?  How does it then get accessed from
a user program?

Thanks.

Bob
--
Robert B. White        Perigee, A Division of Sensis Corp
Software Design Engr   316 Commerce Blvd.
TEL: 315.453.7842x29   Liverpool, NY  13088
FAX: 315.453.7917      www.Perigee.com


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RE: Dual-Port SRAM

[Fillod Stephane]

Bob White wrote:
> What configuration is necessary to map this memory into the kernel?

You need ioremap() and a good book on Linux Kernel Driver development.
Excellent examples are in linux/drivers directory.

> Can you point me to some examples?  How does it then get accessed from
> a user program?

Bob, Wolfgang was talking about this reply ;-)


So, here is the FAQ:

Please have a look at Denx's FAQ for accessing memory bus:


http://www.denx.de/twiki/bin/view/PPCEmbedded/DeviceDrivers#Section_Accessin
gPeripheralsFromUserSpace

For more information, please follow this thread:
	http://lists.linuxppc.org/linuxppc-embedded/200403/msg00059.html


Next time, google and list archive are your friend ;-)


Regards,
Stephane

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