If you have a related question, please click the " Ask a related question " button in the top right corner. The newly created question will be automatically linked to this question. I know that I should confirm this question to open Linux community, but would you please provide your comments for my question?
A uImage includes a U-Boot header which contains the load address that the kernel should be loaded to. This seems nice at first, but then you realize that this makes this entire kernel specific to that load address, defeating the desire to have a kernel that can run "everywhere" well, at least as broadly as possible.
A zImage does not have this header and therefore the load address must be provided somewhere else. Typically, this is done with a bootz U-Boot command that takes the load address and the Device Tree File address as paramaters:. As you mentioned, you can find a lot more information about this in the open community, but I hope this is a good overview for you. Site Search User.
Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. The system I use first boots from stage 1 loader and then it calls u-boot. I want to discard u-boot and directly boot from stage 1 loader. Which type of kernel image do I have to use? A very common practice e. Since a zImage file is self-extracting i. Actually it's pretty stupid to use a zImage inside an uImage.
It is much better to use normal uncompressed kernel image, compress it using just gzip, and use this as poayload for mkimage. This way U-Boot does the uncompresiong instead of including yet another uncompressor with each kernel image. You could choose whatever you want to program for.
For economy of storage, you should probably chose a compressed image over the uncompressed one. Beware that executing the kernel presumably the Linux kernel involves more than just loading the kernel image into memory.
Depending on the architecture e. ARM and the Linux kernel version e. In one instance there was also hardware initialization that U-Boot performed that had to be replicated. That is accurate for all versions of U-Boot which only have the bootm command.
But more recent versions of U-Boot could also have the bootz command that can boot a zImage. Generally used to temporarily boot the hardware to a state where the actual kernel vmlinuz can take over and continue booting. Under normal circumstances are being generated vmlinux After the compression of the kernel becomes zImage , the compressed directory is.
Downloaded to flash is the compressed zImage file. ZImage is composed of compressed vmlinux and decompression program, as shown in the following figure:. View of datasheet, found that the base address of the memory map is 0x, then 0x How did it come? Calling the kernel image. If the zImage is stored inflash, and is linked correctly to be run from flash, then it islegal for the boot loader to call the zImage in flash directly.
ThezImage may also be placed in system RAM at any location and called there. Note that the kernel uses 16K of RAM below the image tostore page tables. It seems that image Used below 32K 0x space to store the kernel page table,.
The download address queries the starting address of SDRAM through the data sheet, and then solidifies. Tech Community Register Log in.
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