Broadcomm BCM4401-B0 and memory upgrade issue.

[Mikko Työläjärvi]

Hi,

The chip is indeed unable to do DMA > 1G, as seen in the linux driver
from Broadcom:

[...]
v3.0.11 (Aug 03, 2005)
======================

     Fixes:
     -------------
        1. Problem: (CQ #13593) 4401 hangs when dealing with memory
                    addresses above 1G.
           Cause  : Hardware DMA limitation.
           Change : Modify the code to ensure memory addresses are
                    below the 1G ceiling.
           Impact : None.
[...]
See <http://www.broadcom.com/support/ethernet_nic/downloaddrivers.php>,
under BCM4401 drivers.

     $.02,
     /Mikko


On Sun, 29 Jan 2006, lyubich_freebsd wrote:

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> Hi,
>
> I applied the suggested changes.
> I got the following message when I load the if_bfe driver.
>
> vm_page_alloc_config: alignment must be a power of 2
>
> After that the kernel panics and system reboots.
>
> I think, if I can specified the allignment correctly, it should work.
> Tell me, how to do this, and I will try it again.
>
> Regards,
> LM
>
>>
>> static int
>> bfe_dma_alloc(device_t dev)
>> {
>>         struct bfe_softc *sc;
>>         int error, i;
>>
>>         sc = device_get_softc(dev);
>>
>>         /* parent tag */
>>         error = bus_dma_tag_create(NULL,  /* parent */
>>                         PAGE_SIZE, 0,             /*
>> alignment, boundary */
>>                         BUS_SPACE_MAXADDR,        /* lowaddr */
>>                         BUS_SPACE_MAXADDR_32BIT,  /* highaddr */
>>                         NULL, NULL,               /* filter,
>> filterarg */
>>                         MAXBSIZE,                 /* maxsize */
>>                         BUS_SPACE_UNRESTRICTED,   /* num of
>> segments */
>>                         BUS_SPACE_MAXSIZE_32BIT,  /* max
>> segment size */
>>                         BUS_DMA_ALLOCNOW,         /* flags */
>>                         NULL, NULL,               /*
>> lockfunc, lockarg */
>>                         &sc->bfe_parent_tag);
>>
>> - Change it to look like this:
>>
>> static int
>> bfe_dma_alloc(device_t dev)
>> {
>>         struct bfe_softc *sc;
>>         int error, i;
>>
>>         sc = device_get_softc(dev);
>>
>>         /* parent tag */
>>         error = bus_dma_tag_create(NULL,  /* parent */
>>                         PAGE_SIZE, 0,             /*
>> alignment, boundary */
>>   /* change this -> */  0x3E7FFFFF /*BUS_SPACE_MAXADDR*/,
>>    /* lowaddr */
>>                         BUS_SPACE_MAXADDR_32BIT,  /* highaddr */
>>                         NULL, NULL,               /* filter,
>> filterarg */
>>                         MAXBSIZE,                 /* maxsize */
>>                         BUS_SPACE_UNRESTRICTED,   /* num of
>> segments */
>>                         BUS_SPACE_MAXSIZE_32BIT,  /* max
>> segment size */
>>                         BUS_DMA_ALLOCNOW,         /* flags */
>>                         NULL, NULL,               /*
>> lockfunc, lockarg */
>>                         &sc->bfe_parent_tag);
>>
>> - Save if_bfe.c
>> - Recompile if_bfe.ko and/or your kernel, test it, and report
>> back what
>>   happens.
>>
>> Wait, let me say that last part again: REPORT BACK WHAT
>> HAPPENS! I hate it when I send people things to test and they
>> vanish into a black hole, never to be heard from again.
>>
>> I suspect this chipset has a DMA limitation that prevents it
>> from performing DMA to/from any addresses outside the first
>> 1GB of RAM.
>> Curiously, I ran into this with a Linksys wireless NIC with
>> the NDISulator, which is based on a Broadcom chipset too
>> (802.11b only).
>>
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