--- Log opened Sun May 15 00:03:29 2011
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11:30 < Farthen> kleemajo_: are https://github.com/kleemajo/openiBoot/blob/master/openiboot/plat-s5l8720/includes/hardware/pmu.h the only pmu registers you know about? i'm asking because the nano 4g uses a lot more registers that are not in that list :) (pmu is the same)
11:55 < user890104> Farthen: the reason why i would like to port/rewrite some exsisting code and not write my own, is because i might understand what each call/function does, but i don't know when i need to use it
11:56 < user890104> so it would me more like "learning by example" until i know more about how these devices work, what is their boot sequence, how do i set up the interfaces and so on
11:57 < Farthen> you don't learn more about the boot sequence by not looking at the boot sequence :)
11:58 < Farthen> peicore/seccore is pretty simple and does not consist of efi hell
12:00 < benedikt93> Farthen, peicore gives already some taste of the efi hell..
12:01 < Farthen> but it is nowhere close to the rest of the hell
12:01 < benedikt93> put reversing it helps understanding how efi works
12:01 < benedikt93> *but
12:01 < Farthen> does peicore even have any cross module calls at all?
12:02 < benedikt93> not cross module calls,..
12:02 < Farthen> what do you consider as efi hell then?
12:03 < benedikt93> ..but it passes "hand-off-blocks" of all kinds to the dxe phase, deals with those firmware volumes and such
12:05 < Farthen> but we don't really need to care about that one if we only want a dfu loader
12:07 < Farthen> and by proofreading my code user890104 could learn more about asm *and* it would have a positive impact :-P
12:14 < Farthen> the other reason would be that TheSeven is not here atm while i am. i don't have any knowledge about rockbox whatsoever but i could help you with seccore/peicore (at least a little bit)
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12:32 < user890104> Farthen: is there some datasheet for the cpu which nano4g uses, like the one for the classics?
12:33 < Farthen> you mean the SoC or the arm core?
12:33 < user890104> the arm core
12:35 < Farthen> i have one. i think i have even sent it to you
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16:22 < hugoatease> hello all
16:22 < hugoatease> i'm experiencing a serious issue with my ipod nano 4g
16:23 < hugoatease> after using the iBugger program, how can I delete the notes exploit ?
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18:18 < kleemajo_> Farthen: sorry, I was asleep. The PMU isn't fully implemented on the 2g touch yet, so those are only a subset of the registers.
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18:24 < Farthen> ah ok, thanks
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18:30 < kleemajo> Farthen: Skipwich was working on some of the other PMU stuff. He's offline right now, but you might be able to bug him
18:31 < kleemajo> Farthen: also, there is a datasheet titled "DA9030-DS07-0501.pdf" that might potentially be found on the internet describing a very similar chip. :)
18:31 < Farthen> aah, that's what i was going to ask :)
18:32 < kleemajo> Farthen: some of the registers are moved around a bit, but it is reasonably similar.
18:32 < Farthen> ok, that's great. i've already been wondering where the heck you got those strings from :)
18:32 < kleemajo> oh I made those up
18:32 < kleemajo> I didn't have the datasheet when I was doing pmu
18:33 < kleemajo> I just figured out what the registers were for from the disassembly
18:35 < Farthen> why are there some defines with same addresses? do these registers have multiple functions?
18:36 < kleemajo> which ones?
18:36 < kleemajo> the PMU_GPMEM_START thing is wrong... it's left over from the code that I started with. I just forgot to remove it
18:38 < Farthen> PMU_ADCC1_ADCSTART / PMU_ADCC1_ADC_AV_4 / PMU_ADCC1_ADCINMUX_BATSNS_SUB
18:38 < Farthen> all the same register
18:38 < kleemajo> oh, those aren't registers
18:38 < kleemajo> they are just the bits that do something in the register
18:38 < Farthen> aah, should have read the c code ;)
18:39 < kleemajo> ya the PMU code right now is really messy...
18:39 < Farthen> ok, so all registers are the ones before the blank line?
18:39 < kleemajo> yes
18:39 < kleemajo> I'll talk to Skipwich and see if he has many any progress on the PMU stuff
18:40 < kleemajo> I'd love to clean all that stuff up, but I don't want to break anything on him
18:41 < Farthen> don't rush him, i can wait. for the time i can just copy the stuff from the apple code as i don't need anything else at the moment
18:42 < Farthen> (copying not in the literal sense of course but in the sense of looking what it does and imitating the same behaviour)
18:43 < kleemajo> Farthen: which pmu functionality are you trying to implement exactly?
18:43 < Farthen> i'm basically trying to implement everything that is done when the device is powered up
18:44 < Farthen> the reason is that this would enable us to use a low level exploit (pwnage 2.0) on that device
18:45 < Farthen> but simply imitating the behaviour of apple should be enough for the now. would only be helpful later eg. for power saving stuff
18:45 < kleemajo> Farthen: Well, I'm working on NAND right now, but my plan is to figure out PMU once this is done.
18:47  * Farthen will probably have a look at that nand code when it's done. it may be similar to the nano 4g's nand
18:47 < Farthen> but again, that has time, i don't have much time for this anyway atm
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19:48  * TheSeven remote-facepalms hugoatease
19:50 < TheSeven> kleemajo: NAND depends on PMU on our side
20:07 < kleemajo> TheSeven: how?
20:08 < kleemajo> tbh I haven't even really looked at the NAND stuff yet. I've been reversing a bunch of task related code that gets called into everywhere in the nand/ftl stuff
20:11 < TheSeven> kleemajo: we need to power up that bugger somehow :P
20:11 < kleemajo> ah :)
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20:12 < kleemajo> TheSeven: Which NAND chip is used in the 4g nano by the way?
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20:16 < [7]> no idea
20:16 < [7]> but we know that it's only one chip
20:16 < [7]> kleemajo: our wiki mentions "TH58NVG6D1DLA87, U20516, JAPAN, 0826MAE" markings
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20:18 < kleemajo> [7]: do you know which FTL is used?
20:21 < Farthen> unfortunately we don't have any nand dumps yet and don't know anything about the ftl IIRC
20:21 < kleemajo> Farthen: do you guys have a decrypted firmware?
20:21 < Farthen> yes, we have a decrypted firmware and a decrypted efi bootloader
20:21 < kleemajo> Farthen: There should be some debug strings of some kind
20:22 < Farthen> yes, there are. but i think we did never look for the ftl name
20:23 < kleemajo> can you check if the string "fmss" appears anywhere?
20:23 < Farthen> let me check
20:25 < Farthen> that's what ida tells me: http://www.pastie.org/1906006
20:26 < Farthen> so yeah, there are some :)
20:26 < Farthen> unfortunately none of those are ftl related
20:27 < Farthen> (at least i think so, don't know what "FIL" means)
20:27 < kleemajo> can you do a search for "yaftl" too please?
20:27 < Farthen> wtf
20:27 < Farthen> SDRAM:08062412  DCB "[FTL:ERR] YAFTL is not supported - init fail",0xA,0
20:27 < Farthen> that's the only one i can find :)
20:28 < kleemajo> how about "whimory"
20:28 < Farthen> yes, there is a source reference to that one: "\soc\samsung\nand\Whimory2_1\FIL\M2\M2flash.c"
20:29 < Farthen> nano 2g uses whimory as well btw
20:29 < kleemajo> interesting
20:30 < Farthen> this may very well be an updated version of whimory
20:31 < Farthen> [7]: nano 2g was whimory 2.0, wasn't it?
20:32 < [7]> no idea
20:32 < kleemajo> Farthen: the "fmss" stuff is on the 2g touch, but none of the other iOS devices
20:33 < Farthen> there is another one btw "\soc\samsung\nand\Whimory2_1\OAM\RTXC\WMROAM.c"
20:35 < kleemajo> Farthen: it looks like the lower levels of the flash stuff are the same on the 2g touch and 4g nano
20:35 < kleemajo> it's kind of weird because the 2g touch stuff is totally different from any other iOS device
20:35 < Farthen> btw i updated the pastie with some more strings i found: http://www.pastie.org/1906006
20:36 < Farthen> hmm, they are probably doing that for sharing some code between those two. nano 3g and classic are also sharing a lot of the same hardware
20:37 < Farthen> you don't know what this "FIL" thing is, do you?
20:37 < kleemajo> I think it stands for "flash interface layer"
20:37 < kleemajo> between the FTL and the hardware
20:38 < kleemajo> if you do a search with alt+b for "ftl" what do you get?
20:38 < kleemajo> are you sure that there are no instances of yaFTL anywhere?
20:38 < Farthen> only the one that states that yaftl is not supported
20:39 < kleemajo> Farthen: other than that, the 2g touch looks almost identical
20:39 < kleemajo> http://pastie.org/1906104
20:40 < Farthen> interesting, indeed
20:41 < kleemajo> Ok, I think that there are 3 main components in the flash structure
20:41 < kleemajo> FIL: lowest level, does direct translations
20:42 < kleemajo> VFL: handles bad blocks or something?
20:42 < kleemajo> FTL: flash translation layer, handles the wear leveling, ...
20:42 < kleemajo> FIL = fmss on 2g touch and 4g nano
20:42 < kleemajo> VFL = whimory2_1?
20:43 < Farthen> no, whimory is the ftl
20:43 < kleemajo> really?
20:43 < Farthen> if i'm not completely dumb
20:43 < kleemajo> maybe it does both FTL and VFL on the 4g nano, but only VFL on the 2g touch
20:43 < Farthen> [7]: ^^?
20:47 < Farthen> for reference, those are all strings i can find by searching for FTL, FIL and VFL: http://www.pastie.org/1906156
20:50 < Farthen> updated that thing with strings for "WMR" where i don't know what that's about
20:51 < [7]> FIL is what we usually call NAND layer
20:51 < [7]> i can't really tell what "whimory" is, but i always assumed it to be both the vfl and ftl layers
21:00 < kleemajo> Farthen: I compiled a document with your stuff and those debug strings from a device from each of the main iOS device families: http://pastie.org/1906226
21:01 < Farthen> that wmr thing seems to be some kind of wrapper for everything if i can see this correctly
21:02 < kleemajo> I think wmr = whimory
21:02 < [7]> kleemajo, Farthen: weren't these ipod nano 4g strings?
21:02 < kleemajo> oops, yes
21:02 < Farthen> ;)
21:03 < [7]> but comparing with the 2g nano might be interesting as well
21:03 < [7]> Farthen: you grabbed these from the EFI idb?
21:03 < kleemajo> Farthen: can you do a search for "nand" too for me? I just noticed that there are a lot of debug strings starting with "[NAND]" or the like
21:03 < Farthen> no, the osos
21:03 < [7]> ok
21:03 < Farthen> efi does not have edbug strings at all
21:03 < Farthen> *debug
21:03 < [7]> it does
21:03 < [7]> things like *BEEP* :P
21:04 < Farthen> ;)
21:06 < Farthen> kleemajo: http://pastie.org/1906262
21:07 < kleemajo> updated version: http://pastie.org/1906267
21:10 < kleemajo> looks like 2g touch and 2g iphone have the same VFL/FTL :)
21:11 < [7]> would make sense, eh?
21:11 < [7]> why invent the wheel twice?
21:12 < Farthen> nano 2g does not have many debug strings
21:13 < kleemajo> for some reason the ftl stuff has massive amounts of debug strings on iOS. About 90% of the debug strings in iboot are ftl related
21:14 < Farthen> probably because those things are heavily complicated and break easily
21:14 < Farthen> -> a broken device sent to apple engineers could be debugged right away
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21:20 < kleemajo> Farthen: I think that I found the PMU function that does the setup stuff that you were looking for (on the 2g touch)
21:21 < kleemajo> http://pastie.org/1906356
21:21 < Farthen> the setup stuff is in peicore on the efi on the nano 4g
21:21 < Farthen> where is that thing located on the touch?
21:22 < kleemajo> llb
21:22 < kleemajo> it isn't in iboot though
21:22 < kleemajo> only pmu function that isn't
21:22 < Farthen> llb is one stage after iboot?
21:22 < kleemajo> bootrom -> llb -> iboot -> ios
21:22 < Farthen> whops ;)
21:22 < kleemajo> dram starts being used a bit after that function is called in llb
21:23 < Farthen> ok so llb would equal to seccore + peicore and iboot to efi hell
21:23 < kleemajo> what is the 4g nano bootchain?
21:24 < Farthen> bootrom -> efi (contains basic setup modules called seccore and peicore) -> osos
21:25 < Farthen> the efi is probably located in a separate area on the user flash
21:25 < kleemajo> cool
21:25 < Farthen> we don't really know but there is no other flash on the device so we don't really know
21:25 < Farthen> (wtf did i just say?)
21:25 < kleemajo> haha
21:26 < Farthen> and yeah it's "cool"... that efi thing has basically the ability to boot from cdrom!
21:26 < Farthen> it looks like they took it from the macs and modified it a little bit to work on the ipod
21:27 < kleemajo> wow
21:27 < Farthen> that is more than overengineering: it's plain stupid :)
21:27 < kleemajo> ya iboot/llb/bootrom on the ios devices are all almost identical, all from the same codebase
21:27 < [7]> the boot process is basically: ROM => seccore => peicore => dxecore => (load like 50 efi modules) => (use them to load osos) => osos (main firmware)
21:28 < kleemajo> Farthen: As for the dram stuff, other than that pmu function, there are some references to addresses that are labeled as "xmc" in the dev tree that get played with before dram starts working.
21:28 < kleemajo> I think that those are the only 2 things that happen before it starts working
21:29 < [7]> xmc == eXternal Memory Controller?
21:29 < Farthen> we don't have a dev tree :/
21:31 < kleemajo> [7]: not sure really... maybe
21:32 < kleemajo> googling the acronym doesn't come up with anything in particular, so it must be something that apple decided on
21:32 < kleemajo> I'm not 100% sure what it does, but something related to memory would make sense
21:33 < kleemajo> it's at 0x3d700000 on the 2g touch
21:37 < bcoco85> http://www.google.es/url?sa=t&source=web&cd=3&ved=0CB4QFjAC&url=http%3A%2F%2Fwww.semiconductorstore.com%2Fpdf%2FNewSite%2FRunCore%2FXMC_Product_Manual.pdf&ei=DUfQTdi0CIGl8QPExvXlDQ&usg=AFQjCNEyYqSC19813j1AxJK0NG7_4ePC1A&sig2=Uw4vj-I7hT1Ynp_hlB3v5w
21:38 < Farthen> "SLC and MLC, capacity range - 32GB~128GB（SLC）and 32GB~512GB（MLC）respectively. "
21:38 < bcoco85> can be this that xmc or its just coincidence?
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21:39 < kleemajo> bcoco85: that looks like a PC card...
21:40 < Farthen> yep, definitely
21:41 < kleemajo> the main thing that "XMC" is used for is Express Mezzanine Card which is what that pdf is for
21:42 < Farthen> is it that important anyway?
21:43 < kleemajo> Farthen: I think that it might have something to do with setting up the dram
21:43 < kleemajo> the only references to it in any of the bootloaders are in llb for the 2g touch
21:43 < Farthen> well, i just wonder if the name itself is that important. setting up the dram shouldn't be that much code i think
21:44 < kleemajo> ah, well knowing the name just lets us know what we are doing with it
21:44 < kleemajo> I was playing with that thing a while ago... if you try to read some of the registers, you get weird green lines on your screen that flash different colors...
21:45 < kleemajo> That kind of put me off from playing with it :P
21:45 < Farthen> interesting :)
21:45 < Farthen> you can't break anything if you don't overclock the cpu. at least that is our experience with the "normal" ipods
21:46 < Farthen> but interesting that reading itself causes screen artifacts
21:46 < kleemajo> I think it was reading, might have been writing
21:47 < [7]> Farthen: it probably broke DRAM access somehow
21:47 < kleemajo> gimme a sec, I'll test
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21:49 < kleemajo> ugh, stupid ipod is in low battery mode and won't boot...
21:50 < Farthen> charge the battery then?
21:50 < kleemajo> I am... it takes a while though
21:50 < [7]> heh, lucky you
21:50 < [7]> i once had an htc phone that could be kinda bricked by fully discharging the battery
21:51  * Farthen remembers that one
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21:56 < kleemajo> hmm, didn't break the lcd on a read
21:56 < kleemajo> must have been a write of some kind
21:56 < kleemajo> anyways, I think those registers are the key to dram
21:57 < Farthen> probably
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22:00 < Farthen> emcore\trunk\loader\ in our svn includes loader code for nano 2g and classic which are both initializing the sdram
22:00 < Farthen> (main.S)
22:00 < Farthen> you may look at how those are doing it - there may be a similarity
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--- Log closed Mon May 16 00:07:11 2011