I am getting the following error with Linux on an iMX35 system:
UBI error: ubi_io_read: error -74 while reading 64 bytes from PEB 1654:0, read 64 bytes
UnCorrectable RS-ECC Error
The NAND flash is a Samsung K9K8G08U0E-SIB0000 which is a die shrink of the K9K8G08U0D-SIB0000 part that works fine. The specifications between the two parts are nearly identical.