MTD issue on the DE2-115

Altera_Forum · ‎04-07-2013

Hi Everyone,

Did anyone successfully running the uClinux and mount the mtd0 (8MB Flash memory) on the DE2-115? I tried to do the "flash_erase /dev/mtd0 0 3" and got error return message "No such device", then I realize it was never recognized from the bootup. I am sure I got my HDL wire correct and set it as a CFI flash component.

output wire [22:0] fl_address_out,

output wire [0:0] fl_read_n_out,

output wire [0:0] fl_write_n_out,

inout wire [7:0] fl_data_out,

output wire [0:0] fl_chipselect_n_out,

input wire fl_ready_busy_out,

output wire fl_RST_N_out,

output wire fl_writeprotect_n_out

As for the kernel setting, I followed the same configuration from http://www.alterawiki.com/wiki/mtd

The devicetree:

ext_flash: flash@0x10000000 {

compatible = "ALTR,cfi_flash-altera_generic_tristate_controller", "cfi-flash";

reg = < 0x10000000 0x00800000 >;

bank-width = < 1 >;

device-width = < 1 >;

# address-cells = < 1 >;

# size-cells = < 1 >;

ext_flash@10000000 {

reg = < 0x10000000 0x00000000 >;

}; //end ext_flash@10000000

}; //end flash@0x10000000 (ext_flash)

The system had been boot up from the jtag and test out the flash read/write capability until recently I wanted to use it as a storage device. :confused: I am suspecting it has to do with the device tree and it's driver since I had a simpler issue with the SPI for the SD Card before. I greatly appreciated if anyone can point me in to the right direction on this.

Thanks.