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Altera_Forum
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15 years ago

Bootloader for uClinux-MMU with EPCS

I'd like to load uClinux-MMU from the EPCS. The physical address for instruction memory is 0x02000000, so the only way to access it is through the TLB. The default boot copier supplied for the EPCS...
Altera_Forum's avatar
Altera_Forum
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15 years ago

The altera epcs boot loader is position independent. It is located in a onchip memory inside the epcs controller. The elf2flash gets load address from the elf, which is in kernel space, such as c0800000. For example, if the epcs controller base is 0x03200000,

sof2flash --epcs --input=NiosII_cycloneII_2c35_full_featured.sof --output=fpga.flash

nios2-flash-programmer --epcs --mmu --base=0x03200000 fpga.flash

elf2flash --epcs --after=fpga.flash --input=zImage --output=zImage.flash --boot=$SOPC_KIT_NIOS2/components/altera_nios2/boot_loader_epcs.srec

nios2-flash-programmer --epcs --mmu --base=0x03200000 zImage.flash

Please note, the sof flash generated using quartus v9.1sp2 doesn't work. I have filed a service request. Please try v7.2 or others.

u-boot can be used instead of zImage.

- Hippo