Re: booting Linux 2.6.15 using a ramdisk and greater than 512MB of DRAM

I think it's a u-boot 'feature' and has nothing to do with the kernel.
xianghua

Scott Coulter wrote:

Xianghua,

That seems to have worked.

Do you think that this is worth investigating?

Thanks,


Scott






___________________________________________________________________

 Scott N. Coulter
 Senior Software Engineer
 
 Cyclone Microsystems          
 370 James Street              Phone:  203.786.5536 ext. 118
 New Haven, CT 06513-3051      Email:  scott.coulter@cyclone.com
 U.S.A.                        Web:    http://www.cyclone.com
___________________________________________________________________

-----Original Message-----
From: Xianghua Xiao [mailto:x.xiao@freescale.com] 
Sent: Friday, June 09, 2006 3:37 PM
To: Scott Coulter
Subject: Re: booting Linux 2.6.15 using a ramdisk and greater than 512MB
of DRAM

try set initrd_high=0xffffffff under u-boot, see if it helps

Scott Coulter wrote:

 

quoted

Hi everyone,

I am not sure if this is a linux question or a u-boot question.  I have
a custom MPC8540 board running U-boot 1.1.4.  With a NFS root
configuration, I have booted and run 2.6.15 with memory from 256MB to
2GB.  If I build a ramdisk image (or even if I use the ramdisk image
with the 85xx version of ELDK 4.0) and then combine it with the kernel
image (vmlinux.gz) using "mkimage", the linux boot blows out with an
oops if I boot the board with more that 512MB of DRAM.  From the U-boot
output, it looks like the ramdisk image is getting copied to the upper
portion of DRAM.  Is it possible that the kernel doesn't map enough
   

DRAM
 

quoted

to allow the image to be read?

I haven't spent a lot of time debugging this once I saw that the 512MB
configuration worked OK.  Has anyone run into this?

Thanks,

Scott



___________________________________________________________________

Scott N. Coulter
Senior Software Engineer

Cyclone Microsystems          
370 James Street              Phone:  203.786.5536 ext. 118
New Haven, CT 06513-3051      Email:  scott.coulter@cyclone.com
U.S.A.                        Web:    http://www.cyclone.com
___________________________________________________________________

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