Date: Wed, 15 Nov 2017 18:10:51 -0500 From: Hyun Hwang <hhwang@sent.com> To: freebsd-arm@freebsd.org Subject: Raspberry Pi 2 - I2C related kpanic @ r324169 Message-ID: <1510787451.4128802.1173973544.3E3E0813@webmail.messagingengine.com>
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Hello, I was trying to get readings from my accelerometer (MMA8451, requires I2C repeated start) via I2C, and suddenly kernel panicked. This is what appeared on the console: ``` Fatal kernel mode data abort: 'Translation Fault (L1)' on read trapframe: 0xd775bcf0 FSR=00000005, FAR=00000000, spsr=40000013 r0 =c07ce200, r1 =ff704000, r2 =00000000, r3 =00000000 r4 =c39eb680, r5 =00000000, r6 =0000ffff, r7 =c06e569c r8 =c07d79e8, r9 =c07d79e8, r10=c3986b00, r11=d775bd90 r12=c090b288, ssp=d775bd80, slr=c0653334, pc =c0653488 [ thread pid 11 tid 100032 ] Stopped at bcm_bsc_fill_tx_fifo+0x74: db> ``` My Raspberry Pi 2 (v1.1) is currently running r325595 (armv7) with no WITNESS option given. I am currently rebuilding the kernel with WITNESS option given, to see if I can get more detailed messages. Judging by the function name, it looks like the I2C repeated start fix applied on r324169 had some problem? -- Hyun Hwang
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