Swamy, Looks like the kernel is probably not running at all yet, may stuck in early initialization.
1. Has the kernel ever ran on this board or is this development to get it running? I have ran into issues with the memory being setup incorrectly (the end address/how much memory) and seen something similar to this. I would review the bootstrap loader output carefully to ensure the memory is setup correctly. 2. Not sure on the tools you are using to build it. You mention the EDK, but you must not be using it's compiler as it's not configured in the EDK to build Linux. I use the ELDK 4.1 right now as we are still figuring out our tool situation. 3. Without a good JTAG emulator, bring up can be painful in my experience. The EDK GDB/XMD is not fully MMU aware, so once the MMU is one it won't allow you to debug. If you have access to an MMU aware debugger that could help. I have used BDI 2000 for these type of problems and it helped. 4. In the absense of an MMU debugger, using the UART to slam bytes out of the serial port can help. The UART lite is easier for that as there's no setup required. The kernel can map an MMU TLB so that the UART is usable early, make sure that is setup in the early startup. Then I just use *(char *)<The UART xmt reg address> = <data byte> in the code to see what it's doing. 5. I would probably see where the udelay is called early in the kernel startup and why. I sometimes hack on it, comment stuff out, to get past it and figure out more data. Not always a good path, but can help. Good luck, John -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of swamydp Sent: Friday, May 16, 2008 8:57 AM To: [email protected] Subject: RE: linux 2.6 hangs at __delay function on Viretx 4 board John Thanks for your suggestions. I looked up the virtual address for __log_buf in System.map and subtracted 0xc0000000 to get the physical address. I then reset the processor from XMD and dump contents of the physical address of __log_buf using 'mrd' command from XMD. All I see is bunch of zeros in those locations. I am debugging but do not have much clue. Swamy John Linn wrote: > > Hi Swamy, > > I have seen this sometime before I think, but don't remember why. > > I see that udelay depends on loops_per_jiffy, have you looked to see > what value it is? Maybe it's garbage and some large value? > > Have you tried dumping the __log_buf to understand how far it got thru > booting the kernel before it got hung? > > I assume you must be using xmd to load the image, you can also use it to > dump the buffer. > > On another processor I have seen it get hung in the calibrate_delay call > from the kernel if the interrupts or timer aren't working, but haven't > ever seen that on the Powerpc. > > Thanks, > John > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On > Behalf Of swamydp > Sent: Tuesday, May 13, 2008 9:29 PM > To: [email protected] > Subject: linux 2.6 hangs at __delay function on Viretx 4 board > > > > I am trying to boot linux 2.6 on HITECH virtex 4(fx60) board. Linux > hangs at > address 0xc00045ec which is in the __udelay function. I am using EDK > 9.2i > and gcc version 4.0.2 for compiling the kernel. The following is the > boot > message from the bootloader. > > loaded at: 00400000 0054E19C > board data at: 0054C120 0054C19C > relocated to: 00404064 004040E0 > zimage at: 00404E55 0054B5B4 > avail ram: 0054F000 02000000 > > Linux/PPC load: console=ttyS0,9600 console=tty0 root=/dev/sda2 > Uncompressing Linux...done. > Now booting the kernel > > Any help is greatly appreciated. I have run out of ideas to fix this. > > Thanks > swamy > > -- > View this message in context: > http://www.nabble.com/linux-2.6-hangs-at-__delay-function-on-Viretx-4-bo > ard-tp17222725p17222725.html > Sent from the linuxppc-embedded mailing list archive at Nabble.com. > > _______________________________________________ > Linuxppc-embedded mailing list > [email protected] > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > > > _______________________________________________ > Linuxppc-embedded mailing list > [email protected] > https://ozlabs.org/mailman/listinfo/linuxppc-embedded > > -- View this message in context: http://www.nabble.com/linux-2.6-hangs-at-__delay-function-on-Viretx-4-bo ard-tp17222725p17276753.html Sent from the linuxppc-embedded mailing list archive at Nabble.com. _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately. _______________________________________________ Linuxppc-embedded mailing list [email protected] https://ozlabs.org/mailman/listinfo/linuxppc-embedded
