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| IrGGu^^ | Does anyone know if thumb2 ISA is backwards compatible with ARM | 19:21 |
|---|---|---|
| IrGGu^^ | ISA | 19:22 |
| freemangordon | IrGGu^^: define "backwards compatible" | 19:22 |
| IrGGu^^ | With packages compiled with ARM ISA | 19:23 |
| freemangordon | yes, it is | 19:23 |
| freemangordon | that is how cssu-thumb works - only some packages are thumb2 compiled, the rest are stock ARM | 19:24 |
| 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 AFAIK | 19:27 |
| freemangordon | not really, applications also benefit from reduced code size and newer gcc | 19:27 |
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| IrGGu^^ | Despite not being compiled for Thumb2? | 19:28 |
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| freemangordon | I 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 them | 19:30 |
| freemangordon | anyway you'll have to run those on cssu-thumb, because of the libstdc++ version | 19:30 |
| freemangordon | and libgcc1 | 19:31 |
| IrGGu^^ | Thanks | 19:31 |
| kerio | freemangordon: giff gcc4.9 | 19:35 |
| freemangordon | kerio: toldya, feel free to build and package it for SB :P | 19:36 |
| freemangordon | I'll take it from there | 19:36 |
| kerio | wget gcc49.tar.gz && tar zxvf gcc49.tar.gz && cd gcc49 && ./configure && make && make install | 19:36 |
| kerio | i bet nothing will go wrong | 19:36 |
| freemangordon | haha | 19:38 |
| kerio | right? | 19:38 |
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| freemangordon | ever tried to build gcc? | 19:38 |
| kerio | once | 19:38 |
| freemangordon | keep in mind, we need it for ScratchBox | 19:38 |
| kerio | everything went wrong | 19:38 |
| bencoh | :)) | 19:39 |
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| freemangordon | how weird :D | 19:44 |
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| * DocScrutinizer05 *eg* | 22:03 | |
| DocScrutinizer05 | freemangordon: congrats for latest kernel build and maemo test run | 22:04 |
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| DocScrutinizer05 | freemangordon: could you port the stock maemo kernel cam drivers? | 22:05 |
| DocScrutinizer05 | N900 camera interface is pretty non-default by design, with the mux and all | 22:05 |
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| freemangordon | DocScrutinizer05: 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 work | 22:55 |
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| DocScrutinizer05 | maemo cannot use "upstream drivers" since there's no other device like N900, so most likely no upstream drivers existing fro the cam hw interface | 23:04 |
| DocScrutinizer05 | N900 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 - AFAIK | 23:06 |
| DocScrutinizer05 | (afaik for the latter bit) | 23:06 |
| DocScrutinizer05 | (the mux is for sure) | 23:06 |
| DocScrutinizer05 | so I guess you will need special N900 cam drivers to handle that mux, or it never will work as expected | 23:07 |
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| DocScrutinizer05 | lemme 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 interface | 23:21 |
| DocScrutinizer05 | this *can't* work in my book | 23:21 |
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| DocScrutinizer05 | you 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 well | 23:23 |
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| DocScrutinizer05 | for your reference: the mux consists of chips N5801 and N5802 (page 2), and the whole thing is controlled (cam A / cam B) via GPIO97 | 23:28 |
| DocScrutinizer05 | which as well serves as "CAM_B_EN" for the front cam | 23:28 |
| DocScrutinizer05 | main cam also sits on I2C bus3 | 23:29 |
| DocScrutinizer05 | btw totally nuts is the touchscreen controller which (data lines) is connected to the LCD(!), not to the SoC | 23:35 |
| DocScrutinizer05 | front cam also sits on I2C3 | 23:47 |
| DocScrutinizer05 | freemangordon: ^^^ | 23:52 |
| DocScrutinizer05 | btw page5 suggests that it's I2C_2 (two!) that goes to flex, no I2C_3 anywhere | 23:56 |
| DocScrutinizer05 | page12 claims it's I2C_3 that's running to the front cam module | 23:57 |
| DocScrutinizer05 | one of both must be incorrect | 23:59 |
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