ALT1250 UBOOT (RK_02_01_02)
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A. ToolChain
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   1. Download Codescape GNU Tools 2017.10-05 to your Linux environment (for example: https://codescape.mips.com/components/toolchain/2017.10-05/downloads.html)
   2. Install toolchain files under /opt/altair/mips-mti-elf/2017.10-05

B. Build u-boot
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   1. change directory to uboot source root, i.e. /home/Work/uboot_RK_02_01_02/u-boot
   2. run Make commands:
      a. make CROSS_COMPILE=/opt/altair/mips-mti-elf/2017.10-05/bin/mips-mti-elf- ARCH=mips O=../tmp/build -C . alt1250_flexipart_vrm_config CONFIG_AC_CHIPSET_ALT1250B=1
      b. make CROSS_COMPILE=/opt/altair/mips-mti-elf/2017.10-05/bin/mips-mti-elf- ARCH=mips O=../tmp/build -C . all CONFIG_AC_CHIPSET_ALT1250B=1
   3. result binary is u-boot.bin file.