[U-Boot] Loading uImage into RAM

[Belisko Marek]

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
>
> 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.

>
> Loading from NAND 128MiB 3,3V 8-bit, offset 0x1c0000
>   Image Name:   Linux-2.6.27.8
>   Image Type:   ARM Linux Kernel Image (uncompressed)
>   Data Size:    1735148 Bytes =  1.7 MB
>   Load Address: 80008000
>   Entry Point:  80008000
>
> ## Booting kernel from Legacy Image at 80100000 ...
>   Image Name:   Linux-2.6.27.8
>   Image Type:   ARM Linux Kernel Image (uncompressed)
>   Data Size:    1735148 Bytes =  1.7 MB
>   Load Address: 80008000
>   Entry Point:  80008000
>   Verifying Checksum ... OK
>   Loading Kernel Image ... OK
>
> OK
>
> Starting kernel ...
>
> Could you help me with this?
>
> abdullah
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BR,

marek

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Marek Belisko - OPEN-NANDRA
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