[U-Boot-Users] Support for SRAM in u-boot

[U-Boot-Users] Support for SRAM in u-boot

[Cacre]

Hi all,
we are developing a product based on AT91SAM9261 and equipped with u-boot v 1.1.5 and linux kernel v 2.6.22.1.
Since our HW architecture foresee a SRAM (1Mx16 and 55 ns of speed time) like the Cypress62167DV3011-55 we need to know if u-boot has the support for it.
Thanks a lot in anticipation for any kind of help/info.
Best regards,
Marco Cacre
Olivetti S.p.a
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[U-Boot-Users] Support for SRAM in u-boot

[llandre]

Marco,

U-Boot provides generic commands to read/write memory locations (md/mw 
respectively) no matter where they physically are. Once your memory 
controller is set up properly (chip select timing etc.) you can easily 
access the SRAM from U-Boot shell.

HTH,
llandre

DAVE Electronics System House - R&D Department
web:   http://www.dave.eu
email: r&d2 at dave-tech.it


> 
> 
> Hi all,
> we are developing a product based on AT91SAM9261 and equipped with 
> u-boot v 1.1.5 and linux kernel v 2.6.22.1.
> Since our HW architecture foresee a SRAM (1Mx16 and 55 ns of speed time) 
> like the Cypress62167DV3011-55 we need to know if u-boot has the support 
> for it.
> Thanks a lot in anticipation for any kind of help/info.
> Best regards,
> Marco Cacre
> Olivetti S.p.a
> 
> 
> ------------------------------------------------------------------------
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> U-Boot-Users mailing list
> U-Boot-Users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/u-boot-users

[U-Boot-Users] Support for SRAM in u-boot

[Cacre]

Thank you for the replay.

I know that u-boot provides commands to access memory but I have seen that in some cases it also properly set-up board specific HW resources included flash, SDRAM etc (I think but not really sure because i'm a newbe on this subject, that some of these initialization could be provided by updating the u-boot with the proper patches).
Our problem is that neither the fist atmel bootstrap code (AT91Bootstrap) nor the atmel (AT91SAM9261 board) u-boot patch provide initialization for that kind of SRAM.

Marco Cacre
Olivetti S.p.a


-----Original Message-----
From: llandre [mailto:r&d2 at dave-tech.it]
Sent: Tue 1/22/2008 3:09 PM
To: Cacre Marco, IT
Cc: u-boot-users at lists.sourceforge.net; Reano Nicolino, IT; Tavarelli Mario, IT; Robatto Lorenzo, IT; Mereu Gianfranco, IT
Subject: Re: [U-Boot-Users] Support for SRAM in u-boot
 
Marco,

U-Boot provides generic commands to read/write memory locations (md/mw 
respectively) no matter where they physically are. Once your memory 
controller is set up properly (chip select timing etc.) you can easily 
access the SRAM from U-Boot shell.

HTH,
llandre

DAVE Electronics System House - R&D Department
web:   http://www.dave.eu
email: r&d2 at dave-tech.it


> 
> 
> Hi all,
> we are developing a product based on AT91SAM9261 and equipped with 
> u-boot v 1.1.5 and linux kernel v 2.6.22.1.
> Since our HW architecture foresee a SRAM (1Mx16 and 55 ns of speed time) 
> like the Cypress62167DV3011-55 we need to know if u-boot has the support 
> for it.
> Thanks a lot in anticipation for any kind of help/info.
> Best regards,
> Marco Cacre
> Olivetti S.p.a
> 
> 
> ------------------------------------------------------------------------
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
> http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> U-Boot-Users mailing list
> U-Boot-Users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/u-boot-users



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[U-Boot-Users] Support for SRAM in u-boot

[llandre]

> I know that u-boot provides commands to access memory but I have seen that in some cases it also properly set-up board specific HW resources included flash, SDRAM etc (I think but not really sure because i'm a newbe on this subject, that some of these initialization could be provided by updating the u-boot with the proper patches).
> Our problem is that neither the fist atmel bootstrap code (AT91Bootstrap) nor the atmel (AT91SAM9261 board) u-boot patch provide initialization for that kind of SRAM.
This is the job you have to do to port U-Boot to your platform.
In platform-specific initialization code (typically located in 
board/<your_board>/<your_board>.c) you can add this stuff.


Regards,
llandre

DAVE Electronics System House - R&D Department
web:   http://www.dave.eu
email: r&d2 at dave-tech.it