questions about flash in nios

Hi qd0090,

For the FPGA .rbf size, just refer to the FPGA datasheet for the uncompressed .rbf size. I don't know which FPGA you want to use but here is an example Arria V .rbf size from the datasheet. Refer to Table 1-72: Uncompressed .rbf Sizes for Arria V Devices from the following link:

https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/arria-v/av_51002.pdf