NXP Semiconductors Layerscape LS1028A BSP, Руководство пользователя, Страница: 51 / 136

• The Felix switch extraction is working on all packets. Therefore, the L2 forwarding in CPU port with bridge case is actually
software forwarding, not hardware forwarding.The frame identifying should be supported so that extraction works only on
PTP packets.
4.2.4 Low Power Universal Asynchronous Receiver/Transmitter
(LPUART)
Description
Low Power Universal asynchronous receiver/transmitter (LPUART) is a high speed and low-power UART. Refer to below table for
the NXP SoCs that can support LPUART.
SoC Num of LPUART module
LS1021A 6
LS1043A 6
U-Boot ConfigurationCompile time options
Below are major U-Boot configuration options related to this feature defined in platform specific config files under include/configs/
directory.
Option Identifier Description
CONFIG_LPUART Enable LPUART support
CONFIG_FSL_LPUART Enable NXP LPUART support
CONFIG_LPUART_32B_REG Select 32-bit LPUART register mode
Choosing predefined U-Boot board configs:
Please make the defconfig include 'lpuart', such as: ls1021atwr_nor_lpuart_defconfig. This will support LPUART.
Runtime options
Env Variable Env Description Sub option Option Description
bootargs Kernel command line
argument passed to kernel console=ttyLP0,1152000 select LPUART0 as the
system console
Kernel Configure Options
Tree View
Below are the configure options need to be set/unset while doing "make menuconfig" for kernel
Kernel Configure Tree View Options Description
Device Drivers --->
Character devices --->
LPUART driver and enable console support
Device Drivers
Layerscape LS1028A BSP User Guide, Rev. 0.3, 04/2019
NXP Semiconductors
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