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[ADV8005]SPI loop through is not possible

I'm using ADV8005 on my application board.
I use SPI flash (MT25QL128ABA) for OSD and connected to SPI2.
MCU(STM32F4) connected to SPI1 and set SPI loop through, but SPI-SCK does not output to SPI flash from the SPI2 port.
Is there something wrong with the following settings?

0x1AB6 = 0x20
0x1ACD = 0x4B
0x1ACE = 0x00 or 0xFF
0x1BD3 = 0xF0

Thank you.

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