sd卡分区

imx6ul_gh

sd卡分区后，执行脚本 mksdcard.sh 出现警告：
################################################################################

        **********WARNING**********

        Selected Device is greater then 16GB
        Continuing past this point will erase data from device
        Double check that this is the correct SD Card

################################################################################

错误：
unmounting device '/dev/sdb1'
unmounting device '/dev/sdb2'
unmounting device '/dev/sdb3'
1024+0 records in
1024+0 records out
1048576 bytes (1.0 MB) copied, 0.707706 s, 1.5 MB/s
Disk /dev/sdb doesn't contain a valid partition table
DISK SIZE - 31914983424 bytes
mksdcard.sh: 151: [: 0: unexpected operator
mkfs.fat: warning - lowercase labels might not work properly with DOS or Windows
mke2fs 1.42.9 (4-Feb-2014)
mksdcard.sh: 167: [: 0: unexpected operator


请问:如果从sd卡启动，超过16G的卡是不是不能用，另外贵公司能否提供SD卡分区的脚本用作参考