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Altera_Forum
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11 years ago

Help required! Baremetal application with custom Preloader

Hi guys, As I want to now more about the design flow for developing on the Cyclone V SoC, I decided to create a new design, which allows to run a simple LED application on the NiosII processor ...
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Altera_Forum
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11 years ago

Fast may work application based on "Unhosted" from soc design examples (http://www.altera.com/support/examples/soc/soc.html) page. And may will be installed 14.0 version of SoC EDS.

Usual code with Baremetal-HWLIB use semihosting/debugger before call main() and requires "finishing" of Preloader codes to simulate host in boot without host from QSPI.

Your program listing must not contain asm-commands "SVC 123456", used in "hard" opening "stdin/stdout" etc.

These theme is periodical discussed on this forum, Altera works for simplification, I demand menu point "Check my .axf to compatibility and write to QSPI with our f***ed Preloader!" :) Because way is very long and not described in details.

P.S. Your situation may get in DS-5 debugger, only connect to powered on (now) board and see cycling in interrupt 2 address -- this is empty service routine for "SVC 123456", which usually hold and process DS-5.

Or run Preloader as part of any working program, load your application direct in Command window ("loadfile NAME"), "set semihosting enabled false" here, and steps in Disassembler -- on first 10 commands program falls to interrupt area forever. This be and after only "set semihosting enabled false" for any "-GNU" program !