CONFIG_UART2_DMA_RX_ON_DMA18 is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_UART2_DMA_RX_ON_DMA18.
Result is shown for kernelversion 6.7-rc3
UART2 DMA RX -> DMA18 TX -> DMA19
configname: CONFIG_UART2_DMA_RX_ON_DMA18
UART2 DMA channel selection
└─>UART2 DMA RX -> DMA18 TX -> DMA19
In linux kernel since version 2.6.39 (release Date: 2011-05-18)
UART2 DMA channel assignment
RX -> DMA18
TX -> DMA19
use SPORT2 default DMA channel
RX -> DMA18
TX -> DMA19
use SPORT2 default DMA channel