Date: Tue, 08 Apr 2014 10:02:15 +0800 From: Xuebing Wang <xbing6@gmail.com> To: Tim Kientzle <kientzle@freebsd.org> Cc: freebsd-arm@freebsd.org Subject: Re: [BeagleBone Black Test PATCH 0/2] port latest u-boot Message-ID: <534358A7.90906@gmail.com> In-Reply-To: <C38629E3-59AC-4100-8748-01FF3F4FBC69@freebsd.org> References: <1396862732-4961-1-git-send-email-xbing6@gmail.com> <C38629E3-59AC-4100-8748-01FF3F4FBC69@freebsd.org>
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Thanks Tim. Do you see a need to port the latest u-boot, with AM33xx code better organized? As you can see, the way to configure is even changed from am335x_evm_config to am335x_boneblack_config. Does the current BeagleBone Black FreeBSD u-boot support below? a) Boot ubldr, kernel and whole system from NFS b) Boot ubldr, kernel ... from Ethernet over USB Thanks. On 04/08/2014 09:41 AM, Tim Kientzle wrote: > On Apr 7, 2014, at 2:25 AM, Xuebing Wang <xbing6@gmail.com> wrote: > >> Hi Tim and all, >> >> This is for discussion only. Would you please advice? >> >> This is motivated by trying to increase CPU frequency for BeagleBone Black. >> >> AM335x cpufreq is not supported yet. In order to achieve the goal to increase >> CPU freq, I am thinking of a 2-step approach: >> 1) port latest u-boot, which have cpufreq better organized >> 2) tweak u-boot opp/freq later > Setting the processor frequency after the OS is running > is not difficult. The AM335x TRM shows exactly how to do it. > > I would not change U-Boot but rather implement > a FreeBSD driver that exposed a read/write sysctl > to reprogram the CPU frequency. > > Getting powerd to work with this should be straightforward. > > Tim > > -- Thanks, Xuebing Wang
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