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The Linux kernel configuration item CONFIG_ETRAX_SERIAL_PORT3_DMA9_IN
has multiple definitions:
arch/cris/Kconfig
The configuration item CONFIG_ETRAX_SERIAL_PORT3_DMA9_IN:
CONFIG_ETRAXFS
Enables the DMA9 input channel for ser3 (ttyS3). If you do not enable DMA, an interrupt for each character will be used when receiving data. Normally you want to use DMA, unless you use the DMA channel for something else.
arch/cris/arch-v32/drivers/Kconfig
The configuration item CONFIG_ETRAX_SERIAL_PORT3_DMA9_IN:
CONFIG_ETRAX_SERIAL_PORT3
Enables the DMA9 input channel for ser3 (ttyS3). If you do not enable DMA, an interrupt for each character will be used when receiving data. Normally you want to use DMA, unless you use the DMA channel for something else.
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