Editing N900 Hardware USB
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But, importantly, the ID pin does nothing directly to the state of the PHY. It simply informs the CPU ''(the MUSB-core)'' of the state of the ID pin, and leaves the driver to properly configure the chip (nota bene, only for OTG, and only for determining the inital state). | But, importantly, the ID pin does nothing directly to the state of the PHY. It simply informs the CPU ''(the MUSB-core)'' of the state of the ID pin, and leaves the driver to properly configure the chip (nota bene, only for OTG, and only for determining the inital state). | ||
- | So, if the kernel can be altered to ignore this pin - which should be trivial if there is host mode support for the chip in the kernel ''(the hw statemachine in MUSB-core won't play nice with whatever kernel does to enable hostmode in a "normal" way)''- then host mode works.(the related sourcecode is to be found here:[http://mxr.maemo.org/fremantle/source/kernel/drivers/usb/musb/musb_core.c#2010], a 'echo host >mode' should work if the kernel driver wasn't crippled in some strange way)''(h-e-n kernel hostmode now is working like this, but still needs another 'echo Fx >/proc/drivers/musb-hdrc' where 'x' is depending on speed. The kernel is "crippled" in a way it can not send a command to PHY to switch to hostmode, as the 1707 '''seems''' doesn't support this - further | + | So, if the kernel can be altered to ignore this pin - which should be trivial if there is host mode support for the chip in the kernel ''(the hw statemachine in MUSB-core won't play nice with whatever kernel does to enable hostmode in a "normal" way)''- then host mode works.(the related sourcecode is to be found here:[http://mxr.maemo.org/fremantle/source/kernel/drivers/usb/musb/musb_core.c#2010], a 'echo host >mode' should work if the kernel driver wasn't crippled in some strange way)''(h-e-n kernel hostmode now is working like this, but still needs another 'echo Fx >/proc/drivers/musb-hdrc' where 'x' is depending on speed. The kernel is "crippled" in a way it can not send a command to PHY to switch to hostmode, as the 1707 '''seems''' doesn't support this - further nvestigation needed, maybe it has this command but it isn't documented. Or we can spoof this command rsp the resulting telegram)'' |
The current understanding by several people who are working on USB host mode is: | The current understanding by several people who are working on USB host mode is: |
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