On 08/28/2016 01:59 PM, Eric Nelson wrote:
> Hi Fabio, Peng, and all.
>
> I just ran into a problem with bus frequency switching
> on the EVK and there appears to be a U-Boot component.
>
> Using the 4.1.15 kernel from git.freescale.com (commit a4d2a08)
> and the latest U-Boot from Stefano's imx tree (commit a3e5519)
> causes the EVK to hang during a bus frequency switch to LOW_POWER
> mode.
>
> The last gasp is this:
> Bus freq set to 24000000 start...
>
> And the code block in question is here:
>
> http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/tree/arch/arm/mach-imx/busfreq_ddr3.c?h=imx_4.1.15_1.0.0_ga#n386
>
> When using the binary U-Boot 2015.07 from the EVK package (commit
> d7d7c43 from git.freescale.com), the kernel gets through the
> frequency switch and produces this message.
>
> Bus freq set to 24000000 done!
>
> I first saw this problem with u-boot-fslc branch v2016.07
> and linux-fslc (4.1.29 and 4.1.30).
>
> Has anybody else experienced this?
>
I forgot to mention it, but this is easy to reproduce
by downing both ethernet interfaces and blanking the
display.
ifconfig eth0 down
ifconfig eth1 down
echo 1 > /sys/class/graphics/fb0/blank
Regards,
Eric
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