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Date:      Thu, 30 Oct 2003 23:59:59 +0100
From:      Vincent Jardin <vjardin@free.fr>
To:        freebsd-atm@freebsd.org
Subject:   if_hatm, bus_dma_tag_create
Message-ID:  <200310302359.59272.vjardin@free.fr>
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Hi,

if_hatm sets lowaddr to BUS_SPACE_MAXADDR_32BIT when it calls 
bus_dma_tag_create().  

It means that bus_dmamap_create() returns mapp = NULL, doesn'it ?

Then, why is lowaddr so high ;-( ?

Regards,
  Vincent

PS:

/*
 * Allocate a handle for mapping from kva/uva/physical
 * address space into bus device space.
 */
int
bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
{
        int error;

        error = 0;

        if (dmat->segments == NULL) {
                dmat->segments = (bus_dma_segment_t *)malloc(
                    sizeof(bus_dma_segment_t) * dmat->nsegments, M_DEVBUF,
                    M_NOWAIT);
                if (dmat->segments == NULL)
                        return (ENOMEM);
        }

        if (dmat->lowaddr < ptoa((vm_paddr_t)Maxmem)) {
                /* Must bounce */
                int maxpages;
...

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