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Re: [Gumstix-users] "bad magic number" after reflash of connex
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From: Leonard S. <lsa...@co...> - 2008-08-29 01:23:07
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Chuck,<br>
<br>
I just noticed your email. The first thing I notice is that your
fatload address has *9* digits, as does the base address of the first
CRC check: The address is a2000000 ("a2" and six digits of zero), NOT
a20000000 ("a2" and 7 digits of zero). Note that the CRC check
response reports "20000000" as the starting address, not "a2000000".
That is a critical difference and invalidates the entire check.<br>
<br>
This remains true all through the copy to flash. (Forgive me for saying
it but) The address space of a 32-bit processor is limited to the
values 00000000-FFFFFFFF, a limit of 8 hex digits. Typically the hex
conversion routines drop all bits beyond 32. This is why the crc32.b
command reports its start address of 20000000: It dropped the
"a00000000". I *could* have noticed that your original email shows the
too-large address and simply failed to count zeroes! :-) :-)<br>
<br>
I have just recently gone back to developing on my Basix, Connex and
Verdex boards, including reloading u-boot, the root filesystem and
kernel, and get consistent results every time...<br>
<br>
Len<br>
<br>
Chuck Randall wrote:
<blockquote
cite="mid:07E...@ro..."
type="cite">
<pre wrap="">Hi Len,
I tried your suggested CRC check before and after copying my rootfs
file, and amazingly, the CRC's don't match!
GUM> fatload mmc 1 a20000000 rootfs
GUM> crc32.b a20000000 ${filesize}
CRC32 for 20000000 ... 20887423 ==> 08702bfc
GUM> protect on 1:0-1
GUM> erase all
GUM> erase all
GUM> cp.b a20000000 40000 ${filesize}
GUM> crc32.b 40000 ${filesize}
CRC32 for 00040000 ... 008c7423 ==> dd4b5066
GUM>
I've tried reloading and checking numerous times, but I always get the
exact same CRC results. What could be going wrong? I'm loading my
rootfs file from a MMC card. The rootfs file is the standard prebuilt
one for connex from the gumstix web site.
Chuck
On Aug 20, 2008, at 6:36 PM, Leonard Samuelson wrote:
</pre>
<blockquote type="cite">
<pre wrap="">This only occurred to me just now... Upon loading new code (either
kernel or filesystem) into flash, I made sure to run a crc32.b on both
the RAM copy just after downloading it, and on the flash copy after
copying the image from RAM to flash. It has been too many months since
I've done this so please check the specific syntax required for the
commands. (repeat: It's been awhile, so check first!) But it's pretty
straightforward, and has saved me much hair pulling and teeth
gnashing.
After the fatload:
GUM> crc32.b 0xa2000000 ${filesize}
<crc32 result>
GUM> cp.b 0xa2000000 0xf00000 ${filesize}
crc32.b 0xf00000 ${filesize}
<crc32 result, must match the first>
It be worth trying to load the image from a TFTP server on the
network:
GUM> tftpboot 0xa2000000 uImage
GUM> crc32.b 0xa2000000 ${filesize}
I believe it's acceptable to leave off the "0x" prefixes.
Len Samuelson
Marc Humphreys wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Chuck,
Give this a try as its helped me get past this in the past.
Erase the flash twice before programming the flash.
I've also erased twice and written twice, but I think I narrowed it
down to
a bad erase, primarily on the factory programmed parts, never seem
to have
the problem again once I successfully programmed it once myself.
Let me know if that works for you.
Marc
-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:gum...@li...">gum...@li...</a>
[<a class="moz-txt-link-freetext" href="mailto:gum...@li...">mailto:gum...@li...</a>] On Behalf Of
Chuck
Randall
Sent: Tuesday, August 19, 2008 1:18 PM
To: General mailing list for gumstix users.
Subject: [Gumstix-users] "bad magic number" after reflash of connex
I just reflashed my connex-400xm with a newly built gumstix-basic-
image. Now I get a "bad magic number" when I try to boot it. What
could have gone wrong? The log of the reflash procedure is show
below.
Chuck
U-Boot 1.2.0 (May 10 2008 - 13:33:03) - 400 MHz - 1604
*** Welcome to Gumstix ***
DRAM:64 MB
Flash: 16 MB
Using default environment
SMC91C1111-0
Net: SMC91C1111-0
Hit any key to stop autoboot: 0
Instruction Cache is ON
Copying kernel to 0xa2000000 from 0x00f00000 (length
0x00100000)...done
## Booting image at a2000000 ...
Bad Magic Number
GUM> mmcinit
Detected: 1970176 blocks of 1024 bytes (1924MB) MMC card.
Vendor: Man 1e OEM ffff "MMC " Date 05/2008
Product: 479
Revision: N/A
GUM> fatls mmc 1
8943420 rootfs
1041360 uimage
2 file(s), 0 dir(s)
GUM> fatload mmc 1 a20000000 rootfs
reading rootfs
8943420 bytes read
GUM> protect on 1:0-1
Protect Flash Sectors 0-1 in Bank # 1
.. done
GUM> erase all
Erase Flash Bank # 1 - Warning: 2 protected sectors will not be
erased!
............................................................................
... done
GUM> cp.b a20000000 40000 ${filesize}
Copy to Flash... done
GUM> fatload mmc 1 a20000000 uimage
reading uimage
1041360 bytes read
GUM> katinstall 100000
Copying kernel from 0xa2000000 to 0x00f00000 (length
0x00100000)...Erasing...
........ done
Erased 8 sectors
Writing...done
GUM> katload 100000
Copying kernel to 0xa2000000 from 0x00f00000 (length
0x00100000)...done
GUM> bootm
## Booting image at a2000000 ...
Bad Magic Number
GUM>
</pre>
</blockquote>
</blockquote>
<pre wrap=""><!---->
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</pre>
</blockquote>
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