From owner-freebsd-mips@FreeBSD.ORG  Sat May  1 16:24:18 2010
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To: fk@bsdler.de
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-mips@freebsd.org
Subject: Re: Trap when setting up ath0
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In message: <1272729476.48777.25.camel@brain.lan.terror.local>
            Florian Kruegl <fk@bsdler.de> writes:
: Hi
: 
: On Sat, 2010-05-01 at 11:09 +0100, Rui Paulo wrote:
: > On 1 May 2010, at 09:38, Florian Kruegl wrote:
: > 
: > > Hi,
: > > 
: > > I get a trap when setting up wlan interface on RS pro. 
: > 
: > Maybe this is because some structure is misaligned. Can you enable AH_DEBUG and ATH_DEBUG and edit {if_ath.c,ah_osdep.c} so that ath_debug=0xffffffff and ath_hal_debug=0xffffffff ?
: > 
: 
: --------------< bootup >--------------
: ath0: <Atheros 9280> irq 1 at device 18.0 on pci0
: ath0: [ITHREAD]
: ath_getchannels: eeprom rd 32924 cc 156 (mapped rd 32924 cc 156)
: location I ecm
: ath_descdma_setup: rx DMA: 40 buffers 1 desc/buf
: ath_descdma_setup: rx DMA map: 0xa0923000 (3840) -> 0x923000 (3840)
: ath_descdma_setup: tx DMA: 200 buffers 10 desc/buf
: ath_descdma_setup: tx DMA map: 0xa0980000 (192000) -> 0x980000 (192000)
: ath_descdma_setup: beacon DMA: 4 buffers 1 desc/buf
: ath_descdma_setup: beacon DMA map: 0xa0970000 (384) -> 0x970000 (384)
: ath0: AR9280 mac 128.2 RF5133 phy 13.0
: --------------< bootup >--------------
: 
: 
: --------------< setup >--------------
: xerxes# ifconfig ath0 up
: ath_init: if_flags 0x8803
: ath_stop_locked: invalid 0 if_flags 0x8803
: Trap cause = 7 (bus error (load or store) - kernel mode)
: [ thread pid 1809 tid 100067 ]
: Stopped at      platform_start+0x1b10:  srl     v0,a1,8
: --------------< setup >--------------

Looks a bit like the atheros bug.  Try applying
http://people.freebsd.org/~imp/ar71xx_ath_war.diff and including the
AH_RXCFG_SDMAMW_4BYTES option in your kernel?

Warner