[U-Boot] Not able access External peripherals in PPC440EP

[U-Boot] Not able access External peripherals in PPC440EP

[suresh kumar]

Hi,
   I am using a PPC 440EP processor based custom designed board which is
based on AMCC's Yosemite as reference design.
I have ported u-boot-1.1.6 onto it. It is working fine but not able to
access external peripherals like NVRAM, ADC, DAC etc. in the board.
When try to read those addresses with MD command it is generating
exception.
Can anybody please help me how to access them


Regards
Suresh

[U-Boot] Not able access External peripherals in PPC440EP

[Wolfgang Denk]

Dear suresh kumar,

In message <BANLkTik0R4ho5d_9XK3iG1ywgJZB=qYyBQ@mail.gmail.com> you wrote:
>
>    I am using a PPC 440EP processor based custom designed board which is
> based on AMCC's Yosemite as reference design.
> I have ported u-boot-1.1.6 onto it. It is working fine but not able to

U-Boot 1.1.6 is more than 5 years old, i. e. it predates the stone
age.  We don;t support this any more.

Please update to current code (v2011.06-rc2 or later).

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
It's hard to make a program foolproof because fools are so ingenious.

[U-Boot] Not able access External peripherals in PPC440EP

[suresh kumar]

Dear Denk,
 Thanks for your suggestion. Now i have migrated to uboot v2011.06-rc2
and the booting sequece is working fine. But the problem still i am
facing is not able access the external periherals like NVRAM and ADC,
DAC etc. What minimum initializations to be done for that.

Thanks in advance

Regards,
Suresh

On 6/20/11, Wolfgang Denk <wd@denx.de> wrote:
> Dear suresh kumar,
>
> In message <BANLkTik0R4ho5d_9XK3iG1ywgJZB=qYyBQ@mail.gmail.com> you wrote:
>>
>>    I am using a PPC 440EP processor based custom designed board which is
>> based on AMCC's Yosemite as reference design.
>> I have ported u-boot-1.1.6 onto it. It is working fine but not able to
>
> U-Boot 1.1.6 is more than 5 years old, i. e. it predates the stone
> age.  We don;t support this any more.
>
> Please update to current code (v2011.06-rc2 or later).
>
> Best regards,
>
> Wolfgang Denk
>
> --
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
> It's hard to make a program foolproof because fools are so ingenious.
>

[U-Boot] Not able access External peripherals in PPC440EP

[Stefan Roese]

Hi Suresh,

On Friday 24 June 2011 12:54:41 suresh kumar wrote:
>  Thanks for your suggestion. Now i have migrated to uboot v2011.06-rc2
> and the booting sequece is working fine. But the problem still i am
> facing is not able access the external periherals like NVRAM and ADC,
> DAC etc. What minimum initializations to be done for that.

You need at least to configure a TLB mapping and setup the EBC (chip select) 
for these peripherals.

Cheers,
Stefan

--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de