> Date: Sun, 3 Apr 2011 13:46:40 +0200
> From: Claudio Jeker <[email protected]>
>
> bce(4) was turned off because of limitations in the DMA engine that allows
> the chip to access only 1G of memory. On systems with more then 1G of
> memory hilarity ensued.
>
> Now I rewrote the driver to use bcopy() to copy the mbufs into a savely
> allocated DMA memory buffer. So the chip will now work with any ammount of
> memory in the machine. It works for me so if you own a bce(4) please test.
> + /* Create the data DMA region and maps. */
> + if ((sc->bce_data = (caddr_t)uvm_km_kmemalloc_pla(kernel_map,
> + uvm.kernel_object, (BCE_NTXDESC + BCE_NRXDESC) * MCLBYTES, 0,
> + UVM_KMF_NOWAIT, 0, (paddr_t)(0x40000000 - 1), 0, 0, 1)) == NULL) {
> + printf(": unable to alloc space for ring");
> + return;
Sorry, but I think drivers should not call uvm memory allocations
directly. Instead we should promote _bus_dmamem_alloc_range() found
on i386 and amd64 to a first class citizen.
