I've already tried to clarify this on xilinx forum, but it is still pending. I have several UARTs in my system, both PS and PL. The PS UARTs can be designated as petalinux system console without a problem, however every time I try to use PL UARTs for system console, the petalinux build fails with very obscure diagnostic:
| make[1]: Leaving directory '/home/ob/pet_prj/h9_2/build/tmp/work/plnx_zynqmp-xilinx-linux/u-boot-xlnx/v2019.01-xilinx-v2019.2+gitAUTOINC+dc61275b1d-r0/build'
| make: *** [Makefile:148: sub-make] Error 2
| make: Leaving directory '/home/ob/pet_prj/h9_2/build/tmp/work/plnx_zynqmp-xilinx-linux/u-boot-xlnx/v2019.01-xilinx-v2019.2+gitAUTOINC+dc61275b1d-r0/git'
| ERROR: oe_runmake failed
| WARNING: exit code 1 from a shell command.
| ERROR: Function failed: do_compile (log file is located at /home/ob/pet_prj/h9_2/build/tmp/work/plnx_zynqmp-xilinx-linux/u-boot-xlnx/v2019.01-xilinx-v2019.2+gitAUTOINC+dc61275b1d-r0/temp/log.do_compile.13996)
ERROR: Task (/tools/Xilinx/petalinux/2019.2/components/yocto/source/aarch64/layers/meta-xilinx/meta-xilinx-bsp/recipes-bsp/u-boot/u-boot-xlnx_2019.2.bb:do_compile) failed with exit code '1'
Opening the above mentioned log file gives:
/home/ob/pet_prj/h9_2/build/tmp/work/plnx_zynqmp-xilinx-linux/u-boot-xlnx/v2019.01-xilinx-v2019.2+gitAUTOINC+dc61275b1d-r0/git/include/configs/platform-top.h:34:2: error: expected '}' before 'PSSERIAL0'
PSSERIAL0 \
I checked the file, ut does not look like I can fix it by adding a missing '}'.
This project was build from scratch (no relicts), if I select PS_UARTx as system it builds fine. If there is a way to fix it please share 
This is complete platform-top.h:
#include <configs/platform-auto.h>
#define CONFIG_NR_DRAM_BANKS 3
#define CONFIG_SYS_BOOTM_LEN 0xF000000
#undef CONFIG_SYS_BOOTMAPSZ
#define DFU_ALT_INFO_RAM \
"dfu_ram_info=" \
"setenv dfu_alt_info " \
"image.ub ram $netstart 0x1e00000\0" \
"dfu_ram=run dfu_ram_info && dfu 0 ram 0\0" \
"thor_ram=run dfu_ram_info && thordown 0 ram 0\0"
#define DFU_ALT_INFO_MMC \
"dfu_mmc_info=" \
"set dfu_alt_info " \
"${kernel_image} fat 0 1\\\\;" \
"dfu_mmc=run dfu_mmc_info && dfu 0 mmc 0\0" \
"thor_mmc=run dfu_mmc_info && thordown 0 mmc 0\0"
/*Required for uartless designs */
#ifndef CONFIG_BAUDRATE
#define CONFIG_BAUDRATE 115200
#ifdef CONFIG_DEBUG_UART
#undef CONFIG_DEBUG_UART
#endif
#endif
/* Extra U-Boot Env settings */
#define CONFIG_EXTRA_ENV_SETTINGS \
SERIAL_MULTI \
CONSOLE_ARG \
PSSERIAL0 \
"nc=setenv stdout nc;setenv stdin nc;\0" \
"ethaddr=00:0a:35:00:22:01\0" \
"importbootenv=echo \"Importing environment from SD ...\"; " \
"env import -t ${loadbootenv_addr} $filesize\0" \
"loadbootenv=load mmc $sdbootdev:$partid ${loadbootenv_addr} ${bootenv}\0" \
"sd_uEnvtxt_existence_test=test -e mmc $sdbootdev:$partid /uEnv.txt\0" \
"uenvboot=" \
"if run sd_uEnvtxt_existence_test; then " \
"run loadbootenv; " \
"echo Loaded environment from ${bootenv}; " \
"run importbootenv; " \
"fi\0" \
"sdboot=echo boot Petalinux; run uenvboot ; mmcinfo && fatload mmc 0 ${netstart} ${kernel_img} && bootm \0" \
"autoload=no\0" \
"clobstart=0x10000000\0" \
"netstart=0x10000000\0" \
"dtbnetstart=0x11800000\0" \
"loadaddr=0x10000000\0" \
"boot_img=BOOT.BIN\0" \
"load_boot=tftpboot ${clobstart} ${boot_img}\0" \
"update_boot=setenv img boot; setenv psize ${bootsize}; setenv installcmd \"install_boot\"; run load_boot ${installcmd}; setenv img; setenv psize; setenv installcmd\0" \
"install_boot=mmcinfo && fatwrite mmc 0 ${clobstart} ${boot_img} ${filesize}\0" \
"bootenvsize=0x40000\0" \
"bootenvstart=0x1360000\0" \
"eraseenv=sf probe 0 && sf erase ${bootenvstart} ${bootenvsize}\0" \
"jffs2_img=rootfs.jffs2\0" \
"load_jffs2=tftpboot ${clobstart} ${jffs2_img}\0" \
"update_jffs2=setenv img jffs2; setenv psize ${jffs2size}; setenv installcmd \"install_jffs2\"; run load_jffs2 test_img; setenv img; setenv psize; setenv installcmd\0" \
"sd_update_jffs2=echo Updating jffs2 from SD; mmcinfo && fatload mmc 0:1 ${clobstart} ${jffs2_img} && run install_jffs2\0" \
"install_jffs2=sf probe 0 && sf erase ${jffs2start} ${jffs2size} && " \
"sf write ${clobstart} ${jffs2start} ${filesize}\0" \
"kernel_img=image.ub\0" \
"load_kernel=tftpboot ${clobstart} ${kernel_img}\0" \
"update_kernel=setenv img kernel; setenv psize ${kernelsize}; setenv installcmd \"install_kernel\"; run load_kernel ${installcmd}; setenv img; setenv psize; setenv installcmd\0" \
"install_kernel=mmcinfo && fatwrite mmc 0 ${clobstart} ${kernel_img} ${filesize}\0" \
"cp_kernel2ram=mmcinfo && fatload mmc 0 ${netstart} ${kernel_img}\0" \
"dtb_img=system.dtb\0" \
"load_dtb=tftpboot ${clobstart} ${dtb_img}\0" \
"update_dtb=setenv img dtb; setenv psize ${dtbsize}; setenv installcmd \"install_dtb\"; run load_dtb test_img; setenv img; setenv psize; setenv installcmd\0" \
"sd_update_dtb=echo Updating dtb from SD; mmcinfo && fatload mmc 0:1 ${clobstart} ${dtb_img} && run install_dtb\0" \
"fault=echo ${img} image size is greater than allocated place - partition ${img} is NOT UPDATED\0" \
"test_crc=if imi ${clobstart}; then run test_img; else echo ${img} Bad CRC - ${img} is NOT UPDATED; fi\0" \
"test_img=setenv var \"if test ${filesize} -gt ${psize}\\; then run fault\\; else run ${installcmd}\\; fi\"; run var; setenv var\0" \
"netboot=tftpboot ${netstart} ${kernel_img} && bootm\0" \
"default_bootcmd=run cp_kernel2ram && bootm ${netstart}\0" \
""
