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where to find toolchian of pandaboard

hello

    i want to download a toolchain to build mlo,uboot,uimage myself, i follow the steps by this website   http://elinux.org/PandaBoard_ES_uboot_howto

    i typed the following steps:

 git clone  git://git.denx.de/u-boot.git
git checkout -b v2011.12 v2011.12
<set ARCH and CROSS_COMPILE environment variables>
make omap4_panda_config
make

and it comes out:

/bin/bash: arm-none-linux-gnueabi-gcc: command not found
/bin/bash: arm-none-linux-gnueabi-gcc: command not found
dirname: missing operand
Try `dirname --help' for more information.
/bin/bash: arm-none-linux-gnueabi-gcc: command not found
/bin/bash: arm-none-linux-gnueabi-ld: command not found
arm-none-linux-gnueabi-gcc -DDO_DEPS_ONLY \
-g -Os -fno-common -ffixed-r8 -msoft-float -D__KERNEL__ -I/home/alan/pandaboard-es/u-boot-linaro-stable/include -fno-builtin -ffreestanding -nostdinc -isystem -pipe -DCONFIG_ARM -D__ARM__ -march=armv5 -Wall -Wstrict-prototypes \
-o lib/asm-offsets.s lib/asm-offsets.c -c -S
/bin/bash: arm-none-linux-gnueabi-gcc: command not found
make: *** [lib/asm-offsets.s] Error 127

  

i guess i have not install the toolchain yet. i have tried hours to find the toolchian, but fail.  can anybody give me a link of how to install the toolchain ? thanks.