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i.e. I have a phone in CDMA from HTC, who provides the CDMA hardware driver (radio-firmware ?),Google Android source tree or HTC?

If the driver is provided by Google Android source tree, then I can compile a custom version of Android for my phone, If from HTC, then I don't know how can I compile an Android and drive the HTC CDMA hardware.

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The radio is closed source and provided by the manufacturer.

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Where to get? Where to put? system.img or other? –  lovespring Mar 10 '11 at 10:28
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@lovespring The manufacturers generally do not provide radio firmware for users to experiment with. People may have extracted it from various ROMs, however, and posted it. You should check the [XDA forum](forum.xda-developers.com) for your device, search for "modem" or "baseband". Normally you flash it directly to the device. –  Matthew Read Mar 10 '11 at 13:58
    
@Matthew Is radio firmware just a .so and living in flash memory? –  lovespring Mar 10 '11 at 16:01
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@lovespring I don't believe it's a library, no. I just opened a modem package for my device and the file is modem.bin and it is written to a specific part of memory, in this case /dev/block/bml12. –  Matthew Read Mar 10 '11 at 16:07
    
@Matthew So, baseband is a device from the point of view of linux. Is the baseband firmware a linux driver? if not, then how to communicate to linux kernel? –  lovespring Mar 10 '11 at 16:38
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