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Hmmm.... Did you not see the SPI bootloader that is provided by Altium? It was added to the library - I believe - some time around Altium Designer 6.8 (When the NB2 was first released).
It is a simple state machine slave core to the tSK3000 (or NIOS-II) that uses a Wishbone multi-master to write the boot code from an SPI flash device to the program memory (SRAM).
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Yes, I know this module and even wanted to use it at the beginning, but afterwards decided to use SPI_WB (w/o the HW-coded booting), having implemented both programming the flash with my application and booting it to the program SRAM from within my program. Besides, I use the same flash to save and read the application's non-volatile data.
This way seemed to me to be more controllable and after all consumed less LE resources then it would be with WB_BOOTLOADER.
Valmar
Honored Contributor
