i.MX ProcessorsのトピックBlinking Phenomenon on kernel booting with u-boot splash screen

Blinking Phenomenon on kernel booting with u-boot splash screen

erickang — Thu, 22 Jan 2015 04:59:53 GMT

Dear All,

I'm using i.MX6Solo, and applied splash screen in u-boot.

u-boot splash screen and kernel booting is operating well.

But the blinking phenomenon was occurred in kernel afte applyingthe u-boot splash screen.

I want to remove the blinking phenomenon in kernel.

Could you tell me how to remove this phenomenon?

Best Regards,

Eric.

erickang — Thu, 22 Jan 2015 07:33:47 GMT

I think this phenomenon was occurred because kernel initialized LVDS again after initializing LVDS in u-boot.

igorpadykov — Thu, 22 Jan 2015 09:07:42 GMT

Hi Eric

problem is that Linux kernel may use different than Uboot clock scheme

for various modules: for example turn on DVFS, cpu frequency scaling,

for that moving IPU/LDB clocks to other sources (PLLs/PFDs) than Uboot.

Also Linux may use different memory organization, turn on L2 cache,

assign other frame buffers for IPU, for that it can turn off it for assigning new tasks.

So shortly, impelementing such task may require significant efforts for modification

both Uboot and Linux.

Best regards

igor

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