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News: Glomation introduces new GECM-9G25 SODIMM system on module

[jcochi2]

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Hi, I'm a beginner in embedded systems, I found this exampleuse the gpio , butI get an error when mapping with the mmap function . use attached files. but I can pass the full basic code gpio use.

[AwareWolf]

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I'm getting the same error; I hope someone out there has the solution!

BTW, what do you mean when you say "but I can pass the full basic code gpio use"?

[admin]

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Access hardware register directly from user space applicaton is not recommended unless it is absolutely sure the Linux kernel will never touch those egisters.  Please upgrade to Linux 2.6.30 and up with built-in GPIO driver.  Examples of using the GPIO driver can be found here, https://www.ridgerun.com/developer/wiki/index.php/How_to_use_GPIO_signals

[AwareWolf]

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Do you have instructions, links, etc. for upgrading the Linux kernel?

[admin]

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The user's manual should have a section describe how to write the kernel to the FLASH.

[AwareWolf]

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OK, but that assumes I have a kernel that's ready to be written. How do I go about getting that kernel in the first place? I'm thinking I need to :

Download the kernel source code
Download the patch for the Glomation board
Build the kernel

Is that right?

Sorry, these are probably pretty basic concepts but I'm new to Linux.

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Detailed instructions on how to build kernel image from source can be found at www.linux4sam.org.  The kernel image built for Atmel evaluation board can be directly used on Glomation boards.

[AwareWolf]

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I followed your link to www.linux4sam.org. I found what I think is the appropriate pre-built kernel for the 9260S board: linux-2.6.30-at91-exp.3-at91sam9260ek.bin

I put that into my tftp directory. I booted my 9260S board and got to the u-boot prompt. I set the autostart variable to "yes". I used this command to try and start the kernel:

tftpboot 0x21800000 linux-2.6.30-at91-exp.3-at91sam9260ek.bin

All that happened was the file was copied over to the board, then I got a message "Starting kernel...", then nothing.

Do I have the right file? What else am I doing wrong?