Date: Wed, 30 Apr 2014 19:28:52 -0400 From: Winston Smith <smith.winston.101@gmail.com> To: Ian Lepore <ian@freebsd.org> Cc: FreeBSD ARM <freebsd-arm@freebsd.org> Subject: Re: BBB @ 1Ghz hangs with 10-STABLE (11-CURRENT is ok) Message-ID: <CADH-AwGS6bWU23gchYu0KPZQ2XPbHjg7fXA6r8aWXQq0mc_v_Q@mail.gmail.com> In-Reply-To: <1398897697.22079.80.camel@revolution.hippie.lan> References: <CADH-AwF%2B59f9%2BtDdiAcQbf2zVS5r7_AMAXQ0TG8mBs0q8bfrKg@mail.gmail.com> <1398897697.22079.80.camel@revolution.hippie.lan>
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On Wed, Apr 30, 2014 at 6:41 PM, Ian Lepore <ian@freebsd.org> wrote: > That backtrace is just the idle thread; usually that's a sign that some > device driver is waiting for an interrupt to finish configuring the > device and it never gets it and just hangs. In cases like this, what should I be collecting? (assuming I can break into the debugger) > Often usb is the culprit -- > we very often rely on u-boot to set up the usb hardware and if it > doesn't the kernel hangs trying to access it. Sometimes you just need a > "usb start" in u-boot before launching the kernel or ubldr. Or maybe > there are some more fixes in 11 that haven't been merged back to 10 yet. The u-boot's are the same for both of my tests, so unless ubldr is doing this, it must be something in 11. > As to the 1ghz stuff, it was my understanding that the patches make > u-boot set the clock faster. It would probably be better to just have > our kernel code do that, but I haven't had time to look at the patches > and see how much work is involved. I looked at the patches and didn't see where it's changing the clock. However, it does appear to be changing the clock. Without the patch, I see the following: am335x_prcm0: Clocks: System 24.0 MHz, CPU 550 MHz With the patch, I see this: am335x_prcm0: Clocks: System 24.0 MHz, CPU 1000 MHz So it appears to be running at almost 2x the speed (and the caches appear to be enabled). Cool!!! -W.
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