Eric Lee / smarc-uboot

12 Feb, 2019

1 commit

  • b5c9636a9   MLK-20886-1 misc: MU: Add MU driver to communicate with M4 ... Browse Code ยป

    Add a common iMX MU driver in misc uclass to communicate with M4.
    The MU message format is defined to use 4 words as below, the driver
    will use all 4 TR/RR in MU to pass one message

    |WORD 0 | WORD 1 | WORD 2 | WORD 3 |
    |SEQ | TYPE | PAYLOAD ADDRESS | PAYLOAD LENGTH |

    - SEQ:
    A sequence id starts from 0 and increases for each request message

    - TYPE:
    0x1: Request. Message sent from AP will set to this value.
    0x2: Response. Message responded from M4 set to this value.
    0x3: MU A side is ready.
    0x4: MU B side is ready.

    - PAYLOAD ADDRESS:
    A pointer to the memory address where the uplayer message is stored

    - PAYLOAD LENGTH:
    The uplayer message length

    Signed-off-by: Ye Li
    (cherry picked from commit aba0e51cc397e1d98be950f9c15619de06ebf782)

    Ye Li