On Tuesday 08 July 2008 21:16:10 Johannes Berg wrote: > > Is there a CompactFlash based WLAN NIC with an AP capable Linux driver? > > There's a Broadcom CF card. I have one, but it's not DMA capable in > Linux because of the PCMCIA subsystem (IIRC). Well, there are several issues. One is that DMA on PCMCIA is damn ugly. It was derived from ISA-DMA, so it is ugly by definition. Second thing is that linux-pcmcia doesn't support it, as it doesn't fit into any way linux does DMA. It could possibly get implemented with the old ISA DMA API, but I don't think anybody is going to make that crufty code portable and usable. Third thing is that not all PCMCIA host controllers capable of driving the card can do DMA in hardware. The third point actually is the major point for me to not try to implement it. The PCMCIA bridge chip in my laptop does not support DMA. I guess a PDA with a CF slot can do DMA, however. (Otherwise the designer has to get kicked ass). So it would theoretically be possible to get DMA working with some ugly hacks. Probably even without touching the damn ugly linux-pcmcia code a lot. -- Greetings Michael. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
