IRC log of #maemo for Sunday, 2014-06-01

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IrGGu^^Does anyone know if thumb2 ISA is backwards compatible with ARM19:21
IrGGu^^ISA19:22
freemangordonIrGGu^^: define "backwards compatible"19:22
IrGGu^^With packages compiled with ARM ISA19:23
freemangordonyes, it is19:23
freemangordonthat is how cssu-thumb works - only some packages are thumb2 compiled, the rest are stock ARM19:24
IrGGu^^I see... So only system components do have to really make use of Thumb2 right?19:25
IrGGu^^As the low level stuff handles memory management AFAIK19:27
freemangordonnot really, applications also benefit from reduced code size and newer gcc19:27
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IrGGu^^Despite not being compiled for Thumb2?19:28
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freemangordonI meant - if they are compiled with thumb2 ISA. It doesn't make much of a sense to use gcc4.7.2 from cssu-thumb "sdk" and to not thumb2 compile them19:30
freemangordonanyway you'll have to run those on cssu-thumb, because of the libstdc++ version19:30
freemangordonand libgcc119:31
IrGGu^^Thanks19:31
keriofreemangordon: giff gcc4.919:35
freemangordonkerio: toldya, feel free to build and package it for SB :P19:36
freemangordonI'll take it from there19:36
keriowget gcc49.tar.gz && tar zxvf gcc49.tar.gz && cd gcc49 && ./configure && make && make install19:36
kerioi bet nothing will go wrong19:36
freemangordonhaha19:38
kerioright?19:38
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freemangordonever tried to build gcc?19:38
kerioonce19:38
freemangordonkeep in mind, we need it for ScratchBox19:38
kerioeverything went wrong19:38
bencoh:))19:39
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freemangordonhow weird :D19:44
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* DocScrutinizer05 *eg*22:03
DocScrutinizer05freemangordon: congrats for latest kernel build and maemo test run22:04
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DocScrutinizer05freemangordon: could you port the stock maemo kernel cam drivers?22:05
DocScrutinizer05N900 camera interface is pretty non-default by design, with the mux and all22:05
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freemangordonDocScrutinizer05: we'd better fix maemo to use the upstream drivers. which still doesn't work, but that's another story :)22:55
freemangordon*don't work22:55
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DocScrutinizer05maemo cannot use "upstream drivers" since there's no other device like N900, so most likely no upstream drivers existing fro the cam hw interface23:04
DocScrutinizer05N900 has a mux on the single existing cam if of SoC, and the kernel drivers for cam0 and cam1 are tweaked to switch that mux according to which of both device nodes got opened atm - AFAIK23:06
DocScrutinizer05(afaik for the latter bit)23:06
DocScrutinizer05(the mux is for sure)23:06
DocScrutinizer05so I guess you will need special N900 cam drivers to handle that mux, or it never will work as expected23:07
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DocScrutinizer05lemme put it this way: you'll have *severe* trouble initializing the cam sensor chip on module load when the mux isn't connecting the cam chip to the appropriate interface. And your drivers for cam0 and cam1 are fighting to set different parameters to same SoC interface23:21
DocScrutinizer05this *can't* work in my book23:21
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DocScrutinizer05you might be able to use default aka upstream drivers for the one cam that by default is connected to SoC via mux (when mux control is in power on [reset] default state) if and only if you don't dare to load the kernel driver for the other cam as well23:23
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DocScrutinizer05for your reference: the mux consists of chips N5801 and N5802 (page 2), and the whole thing is controlled (cam A / cam B) via GPIO9723:28
DocScrutinizer05which as well serves as "CAM_B_EN" for the front cam23:28
DocScrutinizer05main cam also sits on I2C bus323:29
DocScrutinizer05btw totally nuts is the touchscreen controller which (data lines) is connected to the LCD(!), not to the SoC23:35
DocScrutinizer05front cam also sits on I2C323:47
DocScrutinizer05freemangordon: ^^^23:52
DocScrutinizer05btw page5 suggests that it's I2C_2 (two!) that goes to flex, no I2C_3 anywhere23:56
DocScrutinizer05page12 claims it's I2C_3 that's running to the front cam module23:57
DocScrutinizer05one of both must be incorrect23:59

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