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How to read ISP registers of RK3399 in ubuntu?

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Posted at 11/22/2019 09:09:57     
I can read GPIO and many other registers.
But how can I read mipi status register 0xff911c04 or 0xff921c04 in ubuntu?
While I send "io 0xff911c04" through spi port,it halted.And I have to reset it.
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Posted at 11/27/2019 17:32:38     
What is ' through spi port ' ?
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