How WinCE bootloader is Jumping to SDRAM after copying itself to i

Hi,

I have a thearotical questions. As such, my bootloader is working fine.

Here my query is:
The Eboot (Lubbock BSP for PXA250), copies itself from Flash to SDRAM. Then,
it calculates the relative PC address of a lable it has to jump. Then, loads
this address to the PC.
Now, How the compiler knows that this part of the code goes to SDRAM while i
am building a eboot for Flash Address ? Becoz, the compiler is generating the
code for the Flash and the eboot.map file is as follows.

Address Publics by Value Rva+Base Lib:Object

0001:00000000 StartUp a0001000 fwp2.obj
0001:00000020 Undefined_Handler a0001020 fwp2.obj
0001:00000024 SWI_Handler a0001024 fwp2.obj

Please help me to understand.

Thanks & Regards,
Arockiarajesh Peter

Yannick
Wed Jan 04 00:43:42 CST 2006

The bootloader uses boot.bib file to define its internal address mapping.

If you look at a function named "EverythingRelocate" or something like that
in the bootloader source code, you'll see it is using the datas from the bib
file through a specific structure to relocate itself in SDRAM.

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Yannick Chamming's (eMVP)
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"Peter" <peter> a écrit dans le message de news:
18CC7CF5-B455-47D1-9088-93DBD619C410@microsoft.com...
> Hi,
>
> I have a thearotical questions. As such, my bootloader is working fine.
>
> Here my query is:
> The Eboot (Lubbock BSP for PXA250), copies itself from Flash to SDRAM.
> Then,
> it calculates the relative PC address of a lable it has to jump. Then,
> loads
> this address to the PC.
> Now, How the compiler knows that this part of the code goes to SDRAM while
> i
> am building a eboot for Flash Address ? Becoz, the compiler is generating
> the
> code for the Flash and the eboot.map file is as follows.
>
> Address Publics by Value Rva+Base Lib:Object
>
> 0001:00000000 StartUp a0001000 fwp2.obj
> 0001:00000020 Undefined_Handler a0001020 fwp2.obj
> 0001:00000024 SWI_Handler a0001024 fwp2.obj
>
> Please help me to understand.
>
> Thanks & Regards,
> Arockiarajesh Peter