[SOLVED] Bootloading sequence doubt

Hi,

When partitioning the target board's NAND memory for first time(board which dont have any software before), using Uboot bootloader with kernel partition,bootloader partition, root filesystem partition, how does the bootloader instruct the kernel about the memory address of root filesytem to load after kernel was loaded in the power up sequence?

In kernel where will this address info stored after partitioning as the kernel image will be generated in the host environment and at that time kernel image was not aware of these address and after bootloader loads the kernel it transfers the control to kernel?

Please reply!

You can specify this in kernel command line "mtdparts" argument if compiled with CONFIG_MTD_CMDLINE_PARTS, it can be passed by U-Boot or you can compile information about partitions into kernel image using device tree information.

Hi eSelix,

When, Where and how to use/execute mtdparts argument option?

Please help!

You can store it in U-Boot "bootargs" environment variable. It is automatically passed to kernel at boot. You mentioned "Building Embedded Linux Systems" book in another post, this is described in chapter 9 in "Using U-Boot’s Environment Variables".

Hi,

I also like to know the mtdparts arguments usage details. Please reply to that question too.

It is detailed described in U-Boot documentation, in kernel config documentation, and also in book.