[coreboot] Re: Asus F2A85-M Pro: Accessing DMA1_RESET_REG in `isa_dma_init()` hangs system

[Paul Menzel]

Dear coreboot folks,

Am 02.10.20 um 00:50 schrieb Paul Menzel:
> I am trying to finish the port for the Asus F2A85-M Pro (variant of Asus 
> F2A85-M). After getting the serial console working [1], it can be seen, 
> that accessing `DMA1_RESET_REG` in `isa_dma_init()` hangs the system [2].
>
> outb(0, DMA1_RESET_REG);
>
> Commenting this out, coreboot runs through and loads the payload. 
> SeaBIOS has similar code, also hanging the system.
>
> // first reset the DMA controllers
>      outb(0, PORT_DMA1_MASTER_CLEAR);
>
> I am at a loss. If you have an idea, how to fix it, I am all ears.

Please find the serial console log attached.

Kind regards,

Paul
>