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@hotmail.com
From: Wolfgang Denk wd@denx.de To: liutomorrow@hotmail.com CC: u-boot-users@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@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@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@hotmail.com
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