On Wed, 8 Jan 2020 at 18:36, Guenter Roeck <[email protected]> wrote: > > Hi, > > I am trying to fix DMA support with Exynos4210. The original commit > 59520dc65e ("hw/arm/exynos4210: Add DMA support for the Exynos4210") doesn't > really work, primarily because it assigns wrong interrupt lines (no idea > how I thought I tested that). > > Problem I have right now is that the pl330 peripheral DMA in Exynos4210 > depends on a signal from the peripheral device (here: serial ports) > to end a DMA transfer. To make this work, I need a signal from > exynos4210_uart.c to pl330.c to terminate the DMA after the receive > buffer is empty. > > How can I implement this in qemu ?
That depends. How does the UART signal the DMA controller in real hardware? If there's a signal line of some kind, then you can model that with a qemu_irq line which the UART exposes and raises/lowers at the right time, that's then plumbed through by the SoC to the DMA controller. thanks -- PMM
