rpx_cfg() copy to NVRAM?

rpx_cfg() copy to NVRAM?

[Mark S. Mathews]

Hi,

I just noticed the following snippet in rpx_cfg() :

        iic_read(0xa8, eebuf, 0, 128);
        iic_read(0xa8, &eebuf[128], 128, 128);
        {
                int i;
                cp = (u_char *)0xfa000000;

                for (i=0; i<256; i++)
                        *cp++ = eebuf[i];
        }

It appears to be copying the eeprom data to NVRAM.  Is anyone using this?
Can I safely take it out?  We have RPX boards that don't have NVRAM and
this seems a little pointless.

I'm in the process of changing head.S and embed_config.c to work with the
new EP bootloader.

-Mark

Mark S. Mathews

AbsoluteValue Systems      Web:    http://www.absoval.com
P.O. Box 941149            e-mail: mark@absoval.com
Maitland, FL 32794-1149    Phone:  407.644.8582
USA                        Fax:    407.539.1294


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RE: rpx_cfg() copy to NVRAM?

[Matthew Locke]

> I'm in the process of changing head.S and embed_config.c to work with the
> new EP bootloader.

Why?  You don't need to change anything.  There are two configuration
variables in the eeprom that need to be set.
SYPCR needs to be set to turn the watchdog off. Can't remember the value and
I don't have the docs in front of me.
NVRAM needs to be set to non-zero, even if the board doesn't have any nvram.

I don't think this info was sent to the beta-testers, sorry.

Matt


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Re: rpx_cfg() copy to NVRAM?

[Dan Malek]

Matthew Locke wrote:

> SYPCR needs to be set to turn the watchdog off. Can't remember the value and
> I don't have the docs in front of me.

0xffffff88



	-- Dan

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Re: rpx_cfg() copy to NVRAM?

[Mark S. Mathews]

Thanks Dan,  I'm using ffffff89, don't think that last bit matters much
since SW is turned off anyway.
;-)

BTW: I'll send the mods to head.S and embed_config.c later today, once I'm
sure they work.

Thanks,
-Mark

On Tue, 30 May 2000, Dan Malek wrote:

> Matthew Locke wrote:
>
> > SYPCR needs to be set to turn the watchdog off. Can't remember the value and
> > I don't have the docs in front of me.
>
> 0xffffff88
>
>
>
> 	-- Dan
>


Mark S. Mathews

AbsoluteValue Systems      Web:    http://www.absoval.com
P.O. Box 941149            e-mail: mark@absoval.com
Maitland, FL 32794-1149    Phone:  407.644.8582
USA                        Fax:    407.539.1294


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

RE: rpx_cfg() copy to NVRAM?

[Mark S. Mathews]

On Tue, 30 May 2000, Matthew Locke wrote:

> > I'm in the process of changing head.S and embed_config.c to work with the
> > new EP bootloader.
>
> Why?  You don't need to change anything.  There are two configuration
> variables in the eeprom that need to be set.

Why? the HZ key is no longer present and the value of the SB key is now
baud instead of baud/100.

Additionally, based on my read of the bootldr docs, EP (you? ;-) is trying
to set things up so that (in the future) they can change the contents or
format of the eeprom without warning.  Therefore, the bootldr does a
'conversion' of the eeprom data to the RPXU key=value similar format and
writes it to dpram.

I get the sense that the keys and value formats won't change whereas the
contents of eeprom might be changed in the future.

> SYPCR needs to be set to turn the watchdog off. Can't remember the value
> and I don't have the docs in front of me.

I'm using 0xffffff89

> NVRAM needs to be set to
> non-zero, even if the board doesn't have any nvram.

I'm using a 'no-nvram' rpxlite and I have NVRam set to zero.  Works just
fine.  Is this an issue with the bootldr or with what Linux wants from
eeprom?

-Mark

Mark S. Mathews

AbsoluteValue Systems      Web:    http://www.absoval.com
P.O. Box 941149            e-mail: mark@absoval.com
Maitland, FL 32794-1149    Phone:  407.644.8582
USA                        Fax:    407.539.1294


** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

Re: rpx_cfg() copy to NVRAM?

[Dan Malek]

"Mark S. Mathews" wrote:

> It appears to be copying the eeprom data to NVRAM.  Is anyone using this?

No, get rid of it.  It is some forgotten debug code from long ago.
I'll remove it from all of the sources I can find.

Sorry about that.  Thanks for pointing it out.


	-- Dan

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