[U-Boot-Users] Need help booting linux on 8265 eval board

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hello,Mr Wolfgang
  thanks for your reply.  I think i should describe the problem clearly.

  First i explain why i modified the uboot/linux default values. I'm a 
graduate student. the board is designed by my schoolfellow(the board use 
8265,but it is very like the board MPC8266ADS-PCI-AI), but this board is 
not supported by uboot, I must modify the configuration of sdram,IMMR and 
some other registers(from motorola datasheet). now the uboot looks running 
well(it can read/write flash/sdram, scc and fcc is also working), but when 
i boot the linux kernel, i meet the problem. i think  i must let 
imap_addr(linux kernel)=IMMR(uboot), so I modify some default values.
 Now I want to know why linux mapped at 0xC0000000 , the uboot say   "## 
Transferring control to Linux (at address 00000000) ...", so KERNELLOAD 
should be 0xc0000000 or 0x00000000? 
    and if I use linux kernel 2.4.20,  CONFIG_CLOCKS_IN_MHZ should be 0 or 
1?


 
Best regards,
liu ming
liutomorrow at hotmail.com

>From: Wolfgang Denk <wd at denx.de>
>To: 
  <liutomorrow at hotmail.com>
>CC: u-boot-users at lists.sourceforge.net
>Subject: Re: [U-Boot-Users] Need help booting linux on 8265 eval board 
>Date: Sun, 18 Apr 2004 17:10:53 +0200
>
>In message <BAY2-F91LEdyt3cew8k000156e5 at hotmail.com> you wrote:
> >
> >   I have problem  booting linux on 8265 eval board. when I boot the 
linux
> > kernel, the board be dead. the registers look like
> > to be some default values(use powertap pro). I try u-boot1.1, 
ppcboot1.1.5;
>
>Be careful. User the default values as defined in U-Boot  and  Linux,
>and DON'T change these unless you know EXACTLY what you are doing.
>
> > vim Makefile, arch=ppc CROSS_COMPILE=ppc_82xx
> > vim arch/ppc/platforms/ads826x.h, IMAP_ADDR=0x04700000 BCSR=0x04500000
>
>This cannot work. Please leave the mapping as defined by U-Boot and Linux.
> >
> > then the board is dead and the LED(FCC link) coruscate .
> > (I have modified clock calculations for this board. it's the reason?)
> > any ideas? thanks a lot!
>
>You seem to modify a lot of stuff without konwing exactly why - don;t
>do this. The default values are there for a reason - they  are  known
>to work.
>
>Best regards,
>
>Wolfgang Denk
>
>--
>Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
>Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
>"There are three principal ways to lose money: wine, women, and engi-
>neers. While the first two are more pleasant, the third is by far the
>more certain."                           - Baron Rothschild, ca. 1800

>>Hi,
  I have problem  booting linux on 8265 eval board. when I boot the linux 
kernel, the board be dead. the registers look like 

to be some default values(use powertap pro). I try u-boot1.1, ppcboot1.1.5; 
linux kernel 2.4.4 2.4.18 2.4.20.

(1)about kernel
vim Makefile, arch=ppc CROSS_COMPILE=ppc_82xx
vim arch/ppc/platforms/ads826x.h, IMAP_ADDR=0x04700000 BCSR=0x04500000
then make mrproper/make ads826x_config/make oldconfig/make dep/make pImage
(bd info struct is quite same between uboot and linux) 

Is there anything I had ignored?

(2)let's see!(I add some "printf" to display values, "console=ttyS0,9600" 
is added)
=> bootm ffa00000 ffc00000
## Booting image at ffa00000 ...
   Image Name:   Linux-2.4.20-pre7ncsd1
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    634729 Bytes = 619 kB = 0 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
## Current stack ends at 0x03F7FC48 => set upper limit to 0x00800000
## cmdline at 0x007FFF00 ... 0x007FFF23
memstart    = 0x00000000
memsize     = 0x04000000
flashstart  = 0xFF800000
flashsize   = 0x00800000
flashoffset = 0x00000000
sramstart   = 0x00000000
sramsize    = 0x00000000
immr_base   = 0x04700000
bootflags   = 0x00000001
vco         = 266.666 MHz
sccfreq     = 66.666 MHz
brgfreq     = 16.666 MHz
intfreq     = 166.666 MHz
cpmfreq     = 133.333 MHz
busfreq     = 33.333 MHz
ethaddr     = 00:10:EC:00:30:8C
IP addr     = 8.6.0.1
baudrate    =   9600 bps
## Loading RAMDisk Image at ffc00000 ...
   Image Name:   Simple Ramdisk-Image
   Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
   Data Size:    567988 Bytes = 554 kB = 0 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
## initrd at 0xFFC00040 ... 0xFFC8AAF3 (len=567988=0x8AAB4)
   Loading Ramdisk to 03ef4000, end 03f7eab4 ... OK
## Transferring control to Linux (at address 00000000) ...

then the board is dead and the LED(FCC link) coruscate .
(I have modified clock calculations for this board. it's the reason?) 
any ideas? thanks a lot!


--
liu
>>liutomorrow at hotmail.com

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