I saw on My-Symbian forum that it might be the TI Navilink 6.0 which provides Bluetooth, FM receiver/transceivers and A-GPS.

Any idea ?

This is a really good question. The GPS on the n810 was so abysmal, it would be nice to know that lessons were learned and that the n900 will be on par with other GPS enabled devices out there.

From my knowledge the GPS chip on the N810 is a Navilink 4.0 (or 5.0 ?). I hope this will improve dramatically the time it takes to lock-on satellites signals.

I expect that the N810's GPS performance is the result of antenna issues, rather than chipset limitations.

Bluetooth looks to be provided by a dedicated chip (which also supplies the FM receiver)... take a look at the kernel source diff.

That does not say much. The Navilink 6.0 is simply an aggregation of BT+FM core and A-GPS core on the same silicon, in the same way as the OMAP includes ARM core, SGX core, and a few more.

On the other hand, the kernel diff appears to add support for BRF6150 Bluetooth chipset which is a BT v1.2 chipset, so I really don't know what are we supposed to make of that. Perhaps the BRF6150 driver also works with the BL6450 which is in the Navilink 6.0.

The guy at My-Symbian says the Navilink 6.0 chip supports 802.11 b/g/n. The N900 does not support that officially. If I remember correctly most Nokia phones come with a Navilink 5.0 chip.

I read elsewhere that its the same as the one my i8910 sports (that source suggested it was part of the chipset with the 600mhz ARM CPU). Would be good news if so, the i8910 has the best GPS of any device I've used (ie: N95, N95 8GB, N82, N97, Sony Xperia, HTC Touch Pro).

That would seem sensible, but the beta kernel indicates a SI4713 chip for FM TX, and a BCM2048 for FM RX. The BCM2048 is BT 2.0+EDR, but the N900 specs say 2.1. Confusing much? I suppose it's possible they switched at the last minute, and this would also explain why FM RX is not supported.

Oh well, maybe one of these days we'll finally see some dmesg output...