[coreboot] Strange corruption with printk

[Myles Watson]

I divided the CAR copy into pieces to debug memory corruption that I'm
seeing.  It seems to fit a pattern, but I'm not sure what would be causing
it.  Any ideas would be appreciated.

I'm copying the stack from 0c8000-0cfffff to 1f8000-1fffff
Here's the output when copying in 8 pieces

Copying testx from 000ced80 (001fed80)

0 dest 001f8000 src 000c8000 size 1000
1 dest 001f9000 src 000c9000 size 1000
2 dest 001fa000 src 000ca000 size 1000
3 dest 001fb000 src 000cb000 size 1000
4 dest 001fc000 src 000cc000 size 1000
5 dest 001fd000 src 000cd000 size 1000
6 dest 001fe000 src 000ce000 size 1000
ÿ dest 001ff000 src 000cf000 size 1000
Copying done
Done

testx = 5a5a5a5a

Disabling cache as ram now


Notice the ÿ character when the top of the stack (location of testx) gets
copied.

16 pieces (excerpt):

d dest 001fe800 src 000ce800 size 800
ÿ dest 001ff000 src 000cf000 size 800
f dest 001ff800 src 000cf800 size 800

Same character at the top of the stack

32 pieces:

1a dest 001fe800 src 000ce800 size 400
1b dest 001fec00 src 000cec00 size 400
ÿÿ dest 001ff000 src 000cf000 size 400
1d dest 001ff400 src 000cf400 size 400
1e dest 001ff800 src 000cf800 size 400

64 pieces:

36 dest 001fec00 src 000cec00 size 200
ÿÿ dest 001fee00 src 000cee00 size 200
38 dest 001ff000 src 000cf000 size 200

Thanks in advance,
Myles
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