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Question for u-boot env value.

Dear Sir.

U-boot version : 2015.01

I'm setting some env value. for example see below.

Code:

U-boot > printenv

serial_number=abcdefg

I'm want to "serial_number" pass to kernel cmdline.
So, I'm make a "bootargs" env value. see below.

Code:

U-boot > printenv

bootargs='console=ttyS0,115200 board_serial=${serial_number}'

But, i was failed that env serial_number pass to kernel.

Code:

Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32512

Kernel command line: console=ttyS0,115200 board_serial={serial_number}

How can u-boot env variable pass to kernel?

Thank you.

No quotes and make sure you use saveenv to save that information:

Code:

bootargs=console=ttyS0,115200 board_serial=${serial_number}

Did you try delimiting the '$'?

eg:

Code:

setenv bootargs ${bootargs} board_serial=\${serial_number}

I haven't tried this, just noticed the delimit here and saw in your example the '$' had been stripped off:
http://www.denx.de/wiki/view/DULG/UBootEnvVariables