dm8127 why I can't access spi register on M3

tengping lv

why I can't access spi register on M3?

0 Pavel Botev over 12 years ago

Hello,

Take a look in the below thread:

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/t/152066.aspx

Regards,
Pavel

0 tengping lv over 12 years ago in reply to Pavel Botev

It says m3 can access spi in M3，but I can't access spi register.

0 Pavel Botev over 12 years ago in reply to tengping lv

Can you check whether you enable the McSPI clock signals from the device PRCM registers.

Pavel

0 tengping lv over 12 years ago in reply to Pavel Botev

If I don't enable spi clock, I can't access spi register?

But I can access on DSP!

0 Pavel Botev over 12 years ago in reply to tengping lv

In DM814x, register CM_ALWON_SPI_CLKCTRL[1:0] MODULEMODE should have the value of 0x2 (enable) in order to access the SPI registers.

Can you check if you have such register, and what is the value in it when trying to access McSPI register.

Pavel

0 tengping lv over 12 years ago in reply to Pavel Botev

Can you tell me the address of CM_ALWON_SPI_CLKCTRL on dm8127.

I can chek the value of CM_ALWON_SPI_CLKCTRL.

0 Pavel Botev over 12 years ago in reply to tengping lv

Sorry, I do not have it. I have only DM814x documents.

I will notify the DM8127 IPNC team for further support.

Pavel

0 tengping lv over 12 years ago in reply to Pavel Botev

If the value is not 0x02,can I write 0x02 to it to fix access problem?

0 tengping lv over 12 years ago in reply to Pavel Botev

I find CM_ALWON_SPI_CLKCTRL address in uboot's code.

CM_ALWON_SPI_CLKCTRL[1:0] is 0. I write 0x02 to fix the problem.

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