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Altera_Forum
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9 years ago

FPGA-to-HPS SDRAM Bridge in Bare-metal

FPGA-to-HPS SDRAM Bridge in Bare-metal I am using DE1-SoC to start bare-metal programming for dual-core Cortex-A9 ARM hard processor, Cyclone V. I'm trying to read data from SD...
Altera_Forum's avatar
Altera_Forum
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9 years ago

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Thanks for reply sunshine,

It works with me finally. It needs special sequence at operating.

1- Download and run preloader using Eclipes of DS-5, and stop execution at main() by breakpoint .

2- Download .sof file to fpga using quartus programmer.

3- Resume code execution at main() which include 'alt_bridge_init( ALT_BRIDGE_F2S, NULL, NULL); ' instruction.

.

Then enjoy working FPGA-to-HPS SDRAM Bridge in Bare-metal.

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If I am not mistaken, the GSRD uses the uboot to program the FPGA before the bridge init function took place... perhaps by doing so, it will save some effort (and time) of needing to manually pause at breakpoint, and then program the FPGA using Quartus programmer :)