The reason of the crash was because I put get_ram_size() before the sdram controller was initialized. I don't know how it works in sbc8240 but this is what I get in tqm8260:

/* We must be able to test a location outsize the maximum legal size * to find out THAT we are outside; but this address still has to be * mapped by the controller. That means, that the initial mapping has * to be (at least) twice as large as the maximum expected size. */

Now it works.

Thanks.

Wolfgang Denk wd@denx.de@denx.de on 04/28/2005 01:55:16 PM

Sent by: wd@denx.de

To: "KokHow Teh" KokHow.Teh@marconi.com cc: u-boot-users@lists.sourceforge.net

Subject: Re: [U-Boot-Users] PPC: How to access RAM location 0x0 (unmapped) ?

In message OF5DF9F216.6A5D85BA-ON48256FF1.0012D4AD@uk.marconicomms.com you wrote:

  board/sbc8240.c initdram() calls get_ram_size() with CFG_SDRAM_BASE

= 0. Put it into board/mpc8260ads/mpc8260ads.c. and it crashes....

Then either don't do that, or fix it. There are many, many PPC boards using get_ram_size() with CFG_SDRAM_BASE==0 which just work fine.

There is no reason why this should be any problem.

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 That was the thing about deserts. They had their own gravity. They sucked you into the centre. - Terry Pratchett, _Small Gods_