how can i know whether the CFM is big enough for my nios project in max10 ?

i think i am very close to the answer

in https://www.altera.com/en_us/pdfs/literature/an/an730.pdf nios II processor booting methods in max 10 fpga devices

the pdf tells mr that the nios II software.hex is storaged in the UFM(user on chip flash memory)! not in the CFM(configuration on chip flash memory)!

in page 7, "executable code and boot copier must not exceed the size of the ufm",

so the new questions:

1. what is the size of boot copier? i find boot_loader.S is 9KB, the boot_loader_cfi_bits.S is 5 KB ,boot_loader_epcq256_bits_cv.S is 25KB

2. does it means that if i use nios then i can not use UFM to storage some user data?

3. the max UFM is 1376Kb in 10M08, if my nios project's executable code and boot copier only use 1000Kb, can i use the left 376Kb?

4. is there any files can tell me the size of the executable code and boot copier and their address in UFM?