default or selected kernelversion does not have config value CONFIG_MTD_NAND_ECC_SMC.
Result is shown for kernelversion 6.9.9

NAND ECC Smart Media byte order

configname: CONFIG_MTD_NAND_ECC_SMC

Linux Kernel Configuration
└─>Device Drivers
└─>Memory Technology Device (MTD) support
└─>NAND ECC Smart Media byte order
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Software ECC according to the Smart Media Specification.
The original Linux implementation had byte 0 and 1 swapped.