[U-Boot] Loading uImage into RAM

[Abdullah YILDIZ]

Hi Belisko,

On Tue, May 6, 2014 at 12:34 PM, Belisko Marek <marek.belisko at gmail.com> wrote:
> Hi Abdullah,
>
> On Tue, May 6, 2014 at 10:55 AM, Abdullah YILDIZ
> <abdullah.mails at gmail.com> wrote:
>> I'm trying to understand how u-boot loads zImage into RAM.
>>
>> mkimage is called as
>>
>> mkimage -A arm -O linux -T kernel -C none -a 0x80008000 -e 0x80008040
>> -d arch/arm/boot/zImage /bootImage/uImage
>>
Why is entry point different from load address of uImage?
>> Here, 'a' stands for load address and 'e' stands for entry point (64
>> bytes are used for wrapping?). However, when loading uImage from
>> u-boot, boot operation starts at address 0x80100000. Furthermore,
>> u-boot recognizes the load address and entry point as 0x80008000.
> Kernel uImage is loaded from NAND to ram at address which $loadaddr
> points to (check print $loadaddr)
> or env command which loading kerenl image from NAND.
> Then by bootm command is copied to address which is specified in
> mkimage (e.g. 0x80008000). Hope this helps.


Kind regards.

abdullah