Re: CF Card LAN

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"WindowsCE_Developer" <swapnilstud@xxxxxxxxx> wrote in
news:1131111592.294626.142100@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:

> Hello Valter,
>
> Thanks for your reply ... !
>
> At present the hardware guys are debugging some things related to
> the CF card slot, so I just thought it would be better to gather
> some information on the CF card LAN till that time. Ya, I am
> working on a PXA 270 processor and the MainstoneII BSP. So, I
> believe changing the boot-device order to one of the PCMCIA cards
> and then using the appropriate option from the Boot-loader (EBOOT)
> menu would do the trick ... ?

It should.
You may need to work on the timing of the PCMCIA controller
(registers located in the memory controller) if your card does not
work.

> Ya, by the way I had one more query ... till the time the hardware
> guys debug the CF card I am trying to execute an XIP tiney kernel
> image in flash.I have managed to pass the control to the Windows
> CE kernel ... and I am getting the following output ...
[...]

The only input I can give you about XIP is that you should consider
carefully whether to use it.
It will give you more RAM (or allow you to release a device with less
RAM on it), but there are some drawbacks:
- the sistem will be slower. This could be reduced if you use some
kinds of flash (intel strata flash K3) that support "burst access",
but those flash are more expansive than regular ones and the
performances will never reach those of a RAM executing image.
- you will have some problems accessing flash from the OS. This means
that using it as mass-storage or saving the registry will be complex.
You may use Intel IPSM, but this will slow down performances and your
device real-time performances (interrupt latency) could be affected
by flash access.

I tried XIP on a PXA255 board with intel J3 flash chips and the
performances were 30-50% slower than those of a ram-based system
running on the same board.


--
Valter Minute
(the reply address of this message is invalid,
but you may be able to guess the right one)
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