Linux + baremetal

What bootloader are you using?

I typical use uboot, but there are no closure in using any other bootloader

thanks!

Do you want to run bare metal instead of Linux? That is possible to do. I assume your Linux is running on ARM of some sort. There is freeRTOS that could run instead of Linux. Another possibility is running Damn Small Linux(DSL) which will come up in a flash. May need to create an ARM binary. Another one is http://archlinuxarm.org/.

Clem

Hi clem

I want to run a bare metal application on one core and linux on the other cores. And i want the bare metal application to start as soon as the sbc is powered up (i.e. before linux boots)

I was studying the application note whose link i posted in my original post and trying to understand if i can move the initiinitialization code in uboot

@amgalbu

So you want this http://www.wiki.xilinx.com/Multi-OS+Support+%28AMP+%26+Hypervisor%29

Clem

Or just how to program on bare metal like this https://balau82.wordpress.com/2010/02/14/simplest-bare-metal-program-for-arm/

Yes this is the link where i found the application note. The problem is the bare metal applivations starts agter uboot so there is a delay ffrom when the sbc the is powered up to the moment when the bare metal application starts

No this solution does not include linux

No matter how many processors, only one starts in uboot and later the others start when they have been setup for either Linux or bare metal. The delay should be short. If you need logic at immediate start, you may need external digital logic gates for desired output/inputs. One other choice is use PSoC 4 since it has configurable logic on the processor that will be ready at power up. If the hardware already selected, I could conceive of a bare metal approach that "Kick starts" the Linux later on. The Arduino Yun board: Atmel side starts almost instantaneously while the Linux side takes a solid couple of minutes.

Current solution is based on an external logic, but in order to reduce board size and cost, we are trying to embed everything in a single CPU.

What is not clear up to now is whether uboot uses MMU or not. If it is not using MMU, I forcefully have to wait until uboot passes control to Linux kernel. Otherwise I can try to launch the bare metal application directly from uboot...

Thanks for your time and for your answers!