CONFIG_UART3_DMA_RX_ON_DMA15 is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_UART3_DMA_RX_ON_DMA15.
Result is shown for kernelversion 6.7-rc3
UART3 DMA RX -> DMA15 TX -> DMA16
configname: CONFIG_UART3_DMA_RX_ON_DMA15
UART3 DMA channel selection
└─>UART3 DMA RX -> DMA15 TX -> DMA16
In linux kernel since version 2.6.39 (release Date: 2011-05-18)
UART3 DMA channel assignment
RX -> DMA15
TX -> DMA16
use PIXC default DMA channel
RX -> DMA15
TX -> DMA16
use PIXC default DMA channel