working on LPC2378 where I am getting RO data is exceeds the limit and con't downlaod
And your question was?
You obviously have to switch to another processor, or reduce the amount of code + read-only data if you want to use the 2378 chip. Or you may modify your program to store some RO data in a SPI or I2C-connected memory or use the external memory bus for nonvolatile memory.