Hi,
I need one clarification regarding Environment variable declaration & its usage.
#define CONFIG_EXTRA_ENV_SETTINGS \ "brd_mem=62M\0" \ "bootargs_defaults=setenv bootargs " \ "console=${console} " \ "mem=${brd_mem}\0" \ "mmc_args=run bootargs_defaults;" \ "setenv bootargs $(bootargs) " \ "root=${mmc_root} " \ "rootfstype=${mmc_root_fs_type} ip=${ip_method}\0" \ "nand_args=run bootargs_defaults;" \ "setenv bootargs ${bootargs} " \ "root=${nand_root} noinitrd " \ "rootfstype=${nand_root_fs_type} ip=${ip_method}\0" \
The question here is mmc_args re-uses variable bootargs as $(bootargs) & nand_args re-uses it as ${bootargs}. Note the difference in curly & flower brackets. "run mmc_args" fails for me however nand_args runs properly.
My question is 1. Which is correct? 2. What is the difference between the two?
I have seen few boards using both methods.
Thanks in advance
Regards Gururaja