Date: Tue, 4 Sep 2012 19:30:08 -0600 From: Warner Losh <imp@bsdimp.com> To: John Baldwin <jhb@FreeBSD.org> Cc: freebsd-hackers@freebsd.org, freebsd-arm@freebsd.org, Aleksander Dutkowski <aleek@freebsd.org> Subject: Re: availability of interrupts during bootup process Message-ID: <13628135-18C7-4D98-B2DC-60C8AB65A643@bsdimp.com> In-Reply-To: <201209041205.19794.jhb@freebsd.org> References: <CABkKHSbCwiZsRU=J_6EwvhkO63W2vLpgkgEhkDJ%2BdxtsSZez2A@mail.gmail.com> <201209041205.19794.jhb@freebsd.org>
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On Sep 4, 2012, at 10:05 AM, John Baldwin wrote: > On Sunday, September 02, 2012 5:31:21 pm Aleksander Dutkowski wrote: >> hello! >>=20 >> I have PMIC (TWL4030) module connected to the SoC (ARM/OMAP3) via i2c=20= > (iicbus). >> Current solution is that i2c_attach calls bus_generic_attach(dev); >> which calls my pmic probe/attach functions, but main configuration of >> PMIC in done after drivers setup by config_intrhook. >> But I need it to be configured during device attaching, because usb >> ehci driver depends on it. >> Is it possbile? I've tried it but it hangs on waiting for i2c >> interrupt, but someone told me, that interrupts are available during >> bootup for some time. >=20 > No, interrupts do not work during bootup. If you can poll your = hardware > you could use polling until interrupts are enabled (using 'if (cold)' = to > check for the boot time before interrupts are enabled). Are interrupts off, or ithreads not scheduled? I thought I had some = stuff working that needed interrupts, but didn't need scheduling.. Am I = nuts? Warner
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