i'm working on taishan ppc440gx.
now here's what i noticed. snippet of u-boot.bin opened with a hex editor.
fffbffff : 27051956 552d426f 6f742031 2e322e30 '..VU-Boot 1.2.0
fffc000f : 20284a75 6c203232 20323030 38202d20 (Jul 22 2008 -
fffc001f : 31343a31 363a3037 29000000 00000000 14:16:07).......
fffc002f : 00000000 00000000 00000000 00000000 ................
fffc003f : 00000000 00000000 00000000 00000000 ................
and my u-boot.map
.text 0xfffc0000 0x2aa9c
cpu/ppc4xx/start.o(.text)
.text 0xfffc0000 0x2704 cpu/ppc4xx/start.o
0xfffc01bc _start_of_vectors
0xfffc0004 version_string
0xfffc2424 dcache_enable
0xfffc24dc relocate_code
0xfffc24b4 in32
0xfffc24ac in16r
0xfffc2474 in8
0xfffc24bc in32r
0xfffc2484 out16
0xfffc24a4 in16
0xfffc23ec icache_enable
0xfffc246c wr_tcr
0xfffc2100 transfer_to_handler
0xfffc24cc ppcDcbi
0xfffc0100 _start
couple of question.
1) this line ".text 0xfffc0000 0x2aa9c" from u-boot.map
which means .text starts at 0xfffc0000 and with length of 0x2aa9c. right ?
then looking at the hex dump of u-boot.bin looks like there's some data right
after first word (U-Boot 1.2.0...)
what am i missing ?
2) when ppc440gx reset it has 0xfffffffc in its program counter, the instr at
this location is a branch instr. right ?
b) this branch should go to TEXT_BASE which is 0xfffc0000 in my case.
and that location contains 0x05195655. which looks like a "rlwimix" instr.
(rotate left word immediate then mask insert). does this look start of monitor ?
Any insight on how the bootldr starts up would be appreciated too.
thanks !
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