Booting uClinux from SD-Card possible?

Hi,

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Hello,

I have got an DE2-115 Board and was able to set up a Nios II Processor, build the kernel and run it.

Now i wonder if it is possible to put the zImage somehow on an SD-Card so that the processor is able to boot from it. Also i would like to use the SD-Card as the filesystem. If this is possible i don't need to download the zImage all the time and files could be stored permanently.

If its not possible it would be nice if you have other solutions achieving my goals.

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Please refer to my page.

http://www.alterawiki.com/wiki/linux_with_mmu_on_veek/t-pad#unfortunately.2c_if_you_don.27t_have_veek.2ft-pad_kit.2c_but_you_have_de2-115...

Kazu

Thank you for the reply.

Your project is complex, so I have a few questions:

1. I added a "SPI (3 Wire Serial)" component to my Qsys-Design to connect to the mmc/sd. Are there more changes to do there?

2. When I use the "sopc2dts" tool, are there any changes to make?

3. Due the "make menuconfig" witch options shell I select?

4. How do I prepare the SD-Card? Witch partitions are needed and how big should i make them?

5. What Files do I need on the SD-Card? When I make the Kernel I get the "zImage" but what to do with it and do I need the "u-boot" and how do I do that?

EDIT:

I found this document (http://uuoc.org/uclinux_nios2_custom_hardware.pdf) and did all the steps. But I cant see anything on the console.

I guess either the CPU can't read from the SD-Card or doesn't now to read from there :/

I found this document (http://uuoc.org/uclinux_nios2_custom_hardware.pdf) and did all the steps. But I cant see anything on the console.

I guess either the CPU can't read from the SD-Card or doesn't know to read from there :/

I now have been able to get SD-Card working through SPI. I´m able to mount the SD-Card in uClinux can read and write data.

Now I would like to use the SD-Card as Root-Device, so i followed the instructions here: http://www.alterawiki.com/wiki/root_device.

Now the problem:

When I unselect the [ ] Initial RAM filesystem and RAM disk (initramfs/initrd) support and type make the "zImage" is not generated.

The message shown says: "*** No rule to make target `image.zimage.all'"

What can I do to make it work?