I also enabled the DEBUG printfs in u-boot. Below attached is the log of messages I got after displaying memory of "log_buf". It gives a few "OOPS". The kernel mesages must be happening before the kernel gets hold of serial console as well, because I don't see these on my console.
:>bootm 100000 ## Booting image at 00100000 ... Image Name: Rupesh's Kernel Image Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 489707 Bytes = 478.2 kB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK Uncompressing Kernel Image ... OK ## Current stack ends at 0x0075FC18 => set upper limit to 0x0075F410 ## cmdline at 0x0075F310 ... 0x0075F310 bd address = 0x0075FFC4 memstart = 0x00000000 memsize = 0x00800000 flashstart = 0x02800000 flashsize = 0x00200000 flashoffset = 0x00080000 sramstart = 0x00000000 sramsize = 0x00000000 immr_base = 0xFF000000 bootflags = 0x00000001 intfreq = 40 MHz busfreq = 40 MHz ethaddr = 08:00:22:50:70:63 IP addr = 192.168.6.227 baudrate = 19200 bps No initrd ## Transferring control to Linux (at address 00000000) ...
/****************** Here It Hanged !!! *****************/ /***************** Below messages after RESET ************************/
U-Boot 0.3.1 (May 26 2003 - 11:20:21)
CPU: PPC823ZTnnA at 40 MHz: 2 kB I-Cache 1 kB D-Cache *** Warning: CPU Core has Silicon Bugs -- Check the Errata *** Board: FADS with db MPC823 rev ENG or PILOT DRAM: (4 MB SDRAM) 8 MB Top of RAM usable for U-Boot at: 00800000 Reserving 512k for U-Boot at: 00780000 Reserving 128k for malloc() at: 00760000 Reserving 60 Bytes for Board Info at: 0075ffc4 Reserving 44 Bytes for Global Data at: 0075ff98 Stack Pointer at: 0075ff78 New Stack Pointer is: 0075ff78 Now running in RAM - U-Boot at: 00780000 FLASH: 2 MB In: serial Out: serial Err: serial U-Boot relocated to 00780000 Net: SCC ETHERNET ### main_loop entered: bootdelay=0
### main_loop: bootcmd="<UNDEFINED>"
/********************* The location of "log_buf" *****************************************/ :>md 12eee8 0012eee8: 63657373 206f6620 62616420 61726561 cess of bad area 0012eef8: 2c207369 673a2031 310a4f6f 70733a20 , sig: 11.Oops: 0012ef08: 6b65726e 656c2061 63636573 73206f66 kernel access of 0012ef18: 20626164 20617265 612c2073 69673a20 bad area, sig: 0012ef28: 31310a4f 6f70733a 206b6572 6e656c20 11.Oops: kernel 0012ef38: 61636365 7373206f 66206261 64206172 access of bad ar 0012ef48: 65612c20 7369673a 2031310a 3c323e4b ea, sig: 11.<2>K 0012ef58: 65726e65 6c207374 61636b20 6f766572 ernel stack over 0012ef68: 666c6f77 20696e20 70726f63 65737320 flow in process 0012ef78: 63303131 37303230 2c207231 3d633031 c0117020, r1=c01 0012ef88: 31373262 300a4f6f 70733a20 6b65726e 172b0.Oops: kern 0012ef98: 656c2061 63636573 73206f66 20626164 el access of bad 0012efa8: 20617265 612c2073 69673a20 31310a4f area, sig: 11.O 0012efb8: 6f70733a 206b6572 6e656c20 61636365 ops: kernel acce 0012efc8: 7373206f 66206261 64206172 65612c20 ss of bad area, 0012efd8: 7369673a 2031310a 4f6f7073 3a206b65 sig: 11.Oops: ke :>
What could be wrong ?? Please advice.. Rupesh
----- Original Message ----- From: "Wolfgang Denk" wd@denx.de To: "Rupesh S" rupeshs@myw.ltindia.com Cc: u-boot-users@lists.sourceforge.net Sent: Friday, May 23, 2003 6:56 AM Subject: Re: [U-Boot-Users] Doubt on Kernel Linking
In message 00a901c3219b$59d821d0$6706a8c0@SPLENDOR you wrote:
I kept the link address back at 0xc0000000. Doing mkimage , I did load address and entry address as 0x0.
On my FADS823 board, I do a download to 0x100000. And gave a bootm 0x100000.
But the system hangs after Uncompressing Kernel Image... Note: I have compared the bd_info stricture of linux and u-boot . It is
the
same . Also the IMMR address. I do mkimage on gzipped binary image of vmlinux.
Please advice.
Attach a debugger (BDI2000 recommended).
Or reset the board and check the contents of the "log_buf" buffer (post mortem dump) - grep the address from the System.map file, and subtract 0xC0000000 to convert from virtual to physical address; the use U-Boot's "md" command.
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 If all economists were laid end to end, they would not reach a con- clusion.