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What kind of boot loader do I need for arm?
People may code there own boot loader or use one of the many open-source projects with u-boot being the most common. U-boots supports vxWorks, Linux, NetBSD, Plan9, OSE, QNX, Integrity, and OpenRTOS as well a binary images. Many original ARM Linux devices supported a direct boot of Linux without a boot loader.
Which is boot ROM or outside the boot ROM?
Depending on SoC architecture and implementation, boot loader can be a part of boot ROM or outside the boot ROM.Boot loader is program which loads the image/hex into the memory as per Fuse/straps configuration. Boot loader is a program which has the data structure of all the peripheral and booting interfaces.
How does the boot ROM code work on a multi core SoC?
The Boot ROM code uses the given boot select options as well as the state of various FUSE/straps and GPIO settings to determine the boot flow behavior of the SOC. Multi Core SoCs have more than one processor where each processor has its own specific application.
What’s the booting process for an ARM processor?
This answer is mainly in the context or modern Cortex-A CPUs; there are a great variety of ARM platforms. However, for an ARM that is PC like (tablet, cell phone, etc) The ARM CPU will fetch an instruction from either 0x0 or 0xffff0000 (for a Cortex-M, it is data as opposed to an instruction).
What is the booting process for ARM SoCs?
Ie, there is a BIOS built in to many ARM SOC which use the vector, but you need to use something different to get your code to run. Typically the ARM SOC will support multiple boot devices. The device is determined by some FUSE (set by a manufacturing tool) or by sampling pins.
Which is the best bootloader open source project?
A completely-from-scratch hobby operating system: bootloader, kernel, drivers, C library, and userspace including a composited graphical UI, dynamic linker, syntax-highlighting text editor, network stack, etc. A stunningly clean theme for the rEFInd UEFI boot manager.