Re: [U-Boot] TFTP images larger than 16MB causing MachineCheck on 405ex
I am using a new tftp server from fedora 8. (not sure of the exact version, but the system is up to date)
I found the issue... it is with the NAND image (NUB). The NUB destination address is the TEXT_BASE address defined in the top level Makefile
The SPL loads the NUB, and then the NUB relocates itself to the top of RAM (at 0xFF23000 in my case). This relocation fixes the Global table, but the tables for the iminfo command contain pointers to strings for the OS, ARCH, type etc. These string pointer all point back to the NUB TEXT_BASE address, which was set to 0x1000000 (16MB). When downloading an image > 16MB to 0x200000, it overwrites the original image. I thought all the strings would be relative at this location, but the string pointers are global addresses. I relocated the NUB dest address to higher in RAM for now to get around the issue.
The easiest way around this I believe is to hard code a location for the SPL to load the NUB to and then not relocate the NUB.
I thought I remembered something about some strings being accessed from the original location of the UBoot image.
----- Original Message ---- From: vb vb@vsbe.com To: jeffhemstreet@yahoo.com Cc: u-boot@lists.denx.de Sent: Friday, August 22, 2008 4:41:49 PM Subject: Re: [U-Boot] TFTP images larger than 16MB causing MachineCheck on 405ex
I am not sure how much this is related, but it is a known problem that older tftp servers can't serve files larger than 16Mbytes in size.
hth, /vb
On Fri, Aug 22, 2008 at 12:57 PM, jeffhemstreet@yahoo.com wrote:
I have been searching the web, but I have not seen any mention of this kind of problem.
I am using a custom 405ex board based on Kilauea, with NAND boot. (256MB NAND and 256MB DDR DRAM.) The DRAM passes all tests, and the board boots into Linux fine. When adding code to the initrd, we found that any image > 16MB seemed to cause this problem after being loaded. I also tested on Kilauea, and it happens but only with a uboot 1.3.3 image running from NAND, the default NOR image does not fail. (1.3.2 rc2 ?)
To reproduce, I download an initrd (uRamdisk) using tftp in uboot and then use 'iminfo' and it causes a machine check. The strings from the image_get_xxx() functions appear to be bogus and printf crashes. (image_get_os, image_get_arch...) I am debugging it now, but I was hoping someone else had seen this already.
===== FROM UBOOT CONSOLE =====
=> tftp 200000 uRamdisk ... download completes ... => iminfo ## Checking Image at 00200000 ... Legacy image found Image Name: Linux-2.6.25.5 Created: 2008-08-20 22:17:07 UTC Image Type: Machine Check Exception. Caused by (from msr): regs 0ff0f310 Data machine check. NIP: 00000000 XER: 0000005F LR: 0FFCA940 REGS: 0ff0f310 TRAP: 0200 DEAR: 00000000 MSR: 00000000 EE: 0 PR: 0 FP: 0 ME: 0 IR/DR: 00
GPR00: 00000000 0FF0F400 0FF0FF44 60C21FAD 00000000 0FF0F450 01048A68 FFFFFFFF GPR08: 0FFA1BD8 60C21FAD 0FFD8838 00000002 00002FAF 00000000 0FFEAB00 0FFD83F4 GPR16: 0FFD8418 0FFD8424 0FF0F994 0FF0F894 0FF0F7DD 00000000 0FF0F750 0FFE1468 GPR24: 0FF0F418 0FF0F45C 00000000 60C21FAD FFFFFFFF 0FF0F5D7 0FFEC204 0FF0F450 Call backtrace: 0FF0F45C 0FFCAB9C 0FFBE4C8 9AE6C2BD machine check
==========
Any information would help. Thank you, Jeff
Jeff Hemstreet jeffhemstreet@yahoo.com
U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Hi Jeff,
On Monday 25 August 2008, jeffhemstreet@yahoo.com wrote:
I found the issue... it is with the NAND image (NUB). The NUB destination address is the TEXT_BASE address defined in the top level Makefile
The SPL loads the NUB, and then the NUB relocates itself to the top of RAM (at 0xFF23000 in my case). This relocation fixes the Global table, but the tables for the iminfo command contain pointers to strings for the OS, ARCH, type etc. These string pointer all point back to the NUB TEXT_BASE address, which was set to 0x1000000 (16MB).
I just checked this issue on a NAND booting Canyonlands (460EX) board. I added some debug code to print the "uimage_os" pointer from common/image.c. On my target this pointer is relocated to the end of SDRAM too. So it's not pointing to the NUB TEXT_BASE.
Are you sure that those string pointer are incorrect in your case? Perhaps some other pointers or functions pointer are not relocated correctly.
When downloading an image > 16MB to 0x200000, it overwrites the original image. I thought all the strings would be relative at this location, but the string pointers are global addresses. I relocated the NUB dest address to higher in RAM for now to get around the issue.
The easiest way around this I believe is to hard code a location for the SPL to load the NUB to and then not relocate the NUB.
We don't really want to go this way. Biggest problem would be that we would loose the ability to run with different memory size configurations. And if we really have some relocation problems (which is very likely), then they will hit us in the non NAND-booting case too. So all boards ports that relocate will have those problems and they should be solved at the root.
I thought I remembered something about some strings being accessed from the original location of the UBoot image.
It would be great if you could test a little more and let us know where exactly the relocation problem lies. As mentioned above the string pointers from image.c should be fine.
Thanks.
Best regards, Stefan
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jeffhemstreet＠yahoo.com -
Stefan Roese