EST MPC823 board

EST MPC823 board

[James Hughes]

Hello all,

I am going to try to port/run Linux on to one of our custom boards here at
work, based on the EST MPC823 (ICM823A is the label on the EST board)
reference design (quite an old one). I cannot find a reference to this board
in the standard U-Boot list of board, does anyone have any
information/thoughts on the way to approach this. Is there a board that is
similar that I can base things on for example? I would add that our company
is new to Linux, having just chosen it as our new O/S for a new range of
devices - so please forgive any blatant mistakes. 

This project is a precursor to building new product based on the PXA270, but
the custom H/W for that is months and months away, so it seem prudent to get
some practice on the older boards using the MPC823 - the custom hardware
side is very similar and it gives us some practice at running Linux on
custom hardware - the application code we write should port to the newer
hardware when it is ready, and some of the device driver knowledge gained
will also be useful.

If anything thinks this is a bonkers idea, please let me now!!

Regards

James


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Re: EST MPC823 board

[Aristeu Sergio Rozanski Filho]

Hi,
> I am going to try to port/run Linux on to one of our custom boards here at
> work, based on the EST MPC823 (ICM823A is the label on the EST board)
> reference design (quite an old one). I cannot find a reference to this board
> in the standard U-Boot list of board, does anyone have any
> information/thoughts on the way to approach this. Is there a board that is
> similar that I can base things on for example? I would add that our company
> is new to Linux, having just chosen it as our new O/S for a new range of
> devices - so please forgive any blatant mistakes. 
please check if it's close to EP823 (www.embeddedplanet.com for a
datasheet). I got one of those and I'm working to run u-boot on it.

--
Aristeu

Re: EST MPC823 board

[Aristeu Sergio Rozanski Filho]

> please check if it's close to EP823 (www.embeddedplanet.com for a
> datasheet). I got one of those and I'm working to run u-boot on it.
argh. please ignore my last post, I got a EP852 not 823.

--
Aristeu

RE: EST MPC823 board

[James Hughes]

We already have VXWorks working on the board, so a lot of data can be
gleaned from the BSP for that. As a beginner to U-Boot - would the
information from that be sufficient to get to a working build?

EST were taken over by Windriver some time ago - and given the level of
support we have received from them in the past (hence movement to Linux...)
I am not optimistic of getting information from them regarding an 8 year old
board!

for the list : 
Its difficult to see from the U-Boot tree which boards are based on the
MPC623 - is there a quick way of finding which are? grep for 623?

James

-----Original Message-----
From: 'Aristeu Sergio Rozanski Filho' [mailto:aris@cathedrallabs.org]
Sent: 03 August 2005 14:01
To: James Hughes
Subject: Re: EST MPC823 board


> Did you start from an existing board definition, or have you started from
> scratch?
a good way is to find a similar (supported) board and use it as starting
point. but for this you need your board's datasheet.

> I wasn't able to find a datasheet from the embedded planet site - do you
> have a direct link to it?
please ignore my last post, I didn't read the model correctly

> I am going to email EST to see if they have any information - but since
the
> board is pretty ancient, I am not confident.
if you get the datasheet (you must know things like control registers
address and meaning) it's possible to do it. google a bit too, maybe
someone has it.

-- 
Aristeu



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Re: EST MPC823 board

[Wolfgang Denk]

In message <DB1B6B12D0E2F0469EB35A9586066B6ECE75FB@stivesemail.stives.linx.gbr> you wrote:
> We already have VXWorks working on the board, so a lot of data can be
> gleaned from the BSP for that. As a beginner to U-Boot - would the
> information from that be sufficient to get to a working build?

Yes,  assuming  you  have  sufficient  hardware  documentation  (like
schematics) as well.

> Its difficult to see from the U-Boot tree which boards are based on the
> MPC623 - is there a quick way of finding which are? grep for 623?

623? I guess you mean 823? Yes, this is easy to find out. But it will
not help you much. You will still  have  to  port  U-Boot  to  *your*
board.  Forget  about  the  idea  that  two  boards might be "similar
enough" to clone one from the other. They aren't.

You need to understand both the hardware  and  U-Boot,  or  you  will
fail.


And BTW: I think your approach suffers from a serious mistake: to  me
it  makes  little  sense  to  use a MPC8xx based board as model for a
PXA270 target system; there are *huge* differences between these  two
architectures.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
I've already got a female to worry about. Her name is the Enterprise.
	-- Kirk, "The Corbomite Maneuver", stardate 1514.0

Re: EST MPC823 board

[Debora Liu]

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Hello, James Hughes

In message <2005-08-03 18:19:44 JHughes@Linx.co.uk> you wrote:

>information/thoughts on the way to approach this. Is there a board that is
>similar that I can base things on for example? 
My board use uboot/board/svm_sc8xx,it support mpc8xx.

= = = = = = = = = = = = = = = = = = = =
				 
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Debora Liu
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡deboralh@fel.com.cn
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2005-08-04