怎么去解决linux make link boot error on am5718的问题呢

k-km-1.14.3699939/eurasia_km/eurasiacon/binary2_omap_linux_release/target/kbuild/services4/3rd**/bufferclass_example/bufferclass_example_private.o

LD [M] /home/guan/mywork/study/ok5718/OK5718-SDK-V1.0/extra-drivers/ti-sgx-ddk-km-1.14.3699939/eurasia_km/eurasiacon/binary2_omap_linux_release/target/kbuild/bc_example.o

Building modules, stage 2.

MODPOST 2 modules

CC /home/guan/mywork/study/ok5718/OK5718-SDK-V1.0/extra-drivers/ti-sgx-ddk-km-1.14.3699939/eurasia_km/eurasiacon/binary2_omap_linux_release/target/kbuild/bc_example.mod.o

LD [M] /home/guan/mywork/study/ok5718/OK5718-SDK-V1.0/extra-drivers/ti-sgx-ddk-km-1.14.3699939/eurasia_km/eurasiacon/binary2_omap_linux_release/target/kbuild/bc_example.ko

CC /home/guan/mywork/study/ok5718/OK5718-SDK-V1.0/extra-drivers/ti-sgx-ddk-km-1.14.3699939/eurasia_km/eurasiacon/binary2_omap_linux_release/target/kbuild/pvrsrvkm.mod.o

LD [M] /home/guan/mywork/study/ok5718/OK5718-SDK-V1.0/extra-drivers/ti-sgx-ddk-km-1.14.3699939/eurasia_km/eurasiacon/binary2_omap_linux_release/target/kbuild/pvrsrvkm.ko

make[1]: 离开目录“/home/guan/mywork/study/ok5718/OK5718-SDK-V1.0/extra-drivers/ti-sgx-ddk-km-1.14.3699939/eurasia_km/eurasiacon/build/linux2/omap_linux”

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Building U-boot

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make -j `cat /proc/cpuinfo | grep -c processor` -C /home/guan/mywork/study/ok5718/OK5718-SDK-V1.0/OK57xx-linux-uboot CROSS_COMPILE=arm-linux-gnueabihf- ok5718_idk_defconfig

make[1]: *** /home/guan/mywork/study/ok5718/OK5718-SDK-V1.0/OK57xx-linux-uboot: 没有那个文件或目录。 停止。

Makefile:65: recipe for target 'u-boot' failed

make: *** [u-boot] Error 2

[forlinx-ok5718]:~/mywork/study/ok5718/OK5718-SDK-V1.0>