#linux-amlogic on 2023-06-25 — irc logs at libera.irclog.whitequark.org

2021-06-01 12:24 narmstrong changed the topic of #linux-amlogic to: Amlogic mainline kernel development discussion - our wiki http://linux-meson.com/ - ml linux-amlogic@lists.infradead.org - official channel moved from Freenode - publicly logged on https://libera.irclog.whitequark.org/linux-amlogic

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09:08 <f_> :P I'm back.

09:08 <f_> Hi all!

09:19 <f_> https://git.vitali64.duckdns.org/misc/reversing-gxbb-bl2.git/tree/bl2.c#n2045 working on this function

09:19 <f_> I don't think I'll be reimplementing it or anything, but I want to know what it does.

09:20 <f_> First let's try using Ghidra the way it's intended to be used :P

09:59 <f_> I didn't have to name any of the struct members lol

10:00 <f_> Just importing the structs from timing.h into Ghidra and teaching it where the structs are names all members automatically!

10:00 <f_> And they're actually recognised as structs

10:10 <f_> Just pushed. Does make a difference!

10:11 <f_> Actually just imported from acs.h and timing.h

10:12 <f_> They're in U-Boot/arch/arm/include/asm/arch-gxb/

10:12 <f_> (in the Amlogic fork, not upstream U-Boot)

10:12 <f_> https://git.vitali64.duckdns.org/misc/reversing-gxbb-bl2.git/tree/bl2.c?id=8281022fe00344e80b95159cf22964ad58a5c5bf#n17 ddr_timing!

10:12 <f_> https://git.vitali64.duckdns.org/misc/reversing-gxbb-bl2.git/tree/bl2.c?id=8281022fe00344e80b95159cf22964ad58a5c5bf#n63 ddr_set!

10:13 <f_> https://git.vitali64.duckdns.org/misc/reversing-gxbb-bl2.git/tree/bl2.c?id=8281022fe00344e80b95159cf22964ad58a5c5bf#n141 pll_set!

10:13 <f_> https://git.vitali64.duckdns.org/misc/reversing-gxbb-bl2.git/tree/bl2.c?id=8281022fe00344e80b95159cf22964ad58a5c5bf#n157 acs_setting!

10:13 <f_> No need to spend a day naming all struct members now!

10:14 <f_> I told you this does make a difference: https://git.vitali64.duckdns.org/misc/reversing-gxbb-bl2.git/tree/bl2.c?id=8281022fe00344e80b95159cf22964ad58a5c5bf#n2275

10:14 <f_> Actually readable code.

10:14 <f_> Compare this with the bl2.c from yesterday

10:15 <f_> https://git.vitali64.duckdns.org/misc/reversing-gxbb-bl2.git/tree/bl2.c?id=ee93b88d7d17e5f8cc27873f7ec546e3dd92c5bc#n2110

10:15 <f_> Much more readable :)

10:15 <f_> I love Ghidra.

10:15 <f_> If only it was a TUI program with Vim keybindings though lol

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13:55 <f_> Still funny how acs.bin can help reverse-engineering bl2.bin

14:11 <f_> Wow

14:11 <f_> one line fix to fixup ACSBaby!!!

14:11 <f_> Will help me *a lot*

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18:11 <f_> I'm now working on pctl init.

18:11 <f_> As said before, they did a total mess trying to define the registers to write.

18:11 <f_> (or it's Ghidra being Ghidra)

18:12 <f_> Didn't fully look at pre_init

18:12 <f_> but I figured out I could write pctl init while looking at a decompiled ddr_pctl_init() and ddr_pre_init() at the same time.

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