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raspi-keygen
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Merge pull request #2 from gnafuthegreat/patch-1 

Change references to "VP1" to the correct "VC-1"
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nucular 2019-06-24 22:35:18 +02:00 committed by GitHub
parent 61ea7d2f10 a459cf48a9
commit df4a522dbc
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README.md
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@ -1,7 +1,7 @@
# raspi-keygen # raspi-keygen
This is an effort to reverse-engineer the Raspberry Pi license key check for This is an effort to reverse-engineer the Raspberry Pi license key check for
MPEG-2 and VP1 hardware video encoding. MPEG-2 and VC-1 hardware video encoding.
## Patch ## Patch
@ -70,7 +70,7 @@ not_MPG2: ; CODE XREF: is_licensed+68j
addcmpbeq r2, 0, 0, deny addcmpbeq r2, 0, 0, deny
``` ```
Here, two memory locations (`0xEE86680` for MPEG-2 and `0xEE869E0` for VP1) Here, two memory locations (`0xEE86680` for MPEG-2 and `0xEE869E0` for VC-1)
that point to the `.bss` segment are checked to determine the return value of that point to the `.bss` segment are checked to determine the return value of
`is_licensed`. There are no other obvious references to these locations in `is_licensed`. There are no other obvious references to these locations in
`start.elf`, so memory-breakpoint debugging (**TBD**) is probably needed. `start.elf`, so memory-breakpoint debugging (**TBD**) is probably needed.