Honored Contributormy system includes Flash,EPCS,etc,and has a EPCS controller.i want to read and write the EPCS in the nios.i tried to open the device using "alt_flash_open_dev()",but it's alway wrong--"can not open the device".so i used IORD()/IOWR(),and found Flash could be read/writen correctly,but EPCS couldn't be read/writen.Why?is anybody help me?
Honored ContributorTry building the Nios project and using the "memtest" program. Part of the memtest program can also test the EPCS. If Nios can see the EPCS device then it should be able to access it.
Honored Contributorif your target board is a customer board,first you'd add your board to the SOPC system.
Honored ContributorIs your flash (EPCS) empty? Try downloading your program to flash, then try to debug it again. I had the same problem. If the flash was empty, it would not open the EPCS device correctly.
Let me know if this was the case, MikeHonored Contributorthanks ,and i found it's short of a header file called "sys/alt_flash_dev()".firstly i think we should initialize the device, in my nios program, there's an initializing sentence (javascript:showjdsw('jd_t','j_'))-"alt_sys_init()", if i did not include the header file-sys/alt_flash_dev(), there is a warning. and the device(epcs & ext_flash) can not be opend. i don't know why.
Honored ContributorHi,
include these files also, #include "altera_avalon_epcs_flash_controller.h" #include "sys/alt_flash.h"// used for EPCS #include "sys/alt_flash_dev.h"// used for EPCS# include "sys/alt_sys_init.h" you need to open the device using the name of the EPCS device, with the value stored in the system.h file, like below // open flash device pEPCS = alt_flash_open_dev(EPCS_CONTROLLER_NAME); this is what is located in the generated system.h header, #define epcs_controller_name"/dev/epcs_controller"Honored Contributorhi,
thanks very much, mike21, it's perfect!Honored Contributorhi,
how about the ext_flash? it's the same problem.Honored Contributorhi,
sometimes, it can be opened, but it often can not be opened. i don't know why.Honored ContributorIs the flash programmed and is the NIOS set to boot from flash?
Honored Contributoryes, the nios is set to boot from flash. and in the nios program when the nios program tries to open the flash, the system halted.why?
