[U-Boot-Users] location independence

[U-Boot-Users] location independence

[cam at sysgo.com]

Hello,

I have to evaluate if U-Boot fulfills an special requirement, and for that I
have to answer the following:

Is the part of the U-Boot code that is executed from flash "location
independent"? By "location independent" I mean code that can be executed from
any address range (in flash) without any modification. The target is MPC85xx.
(The bootpage is obviously out of question).

Best regards,
Carlos Mitidieri

[U-Boot-Users] location independence

[TXEMA LOPEZ]

Is the part of the U-Boot code that is executed from flash "location
independent"? By "location independent" I mean code that can be executed from
any address range (in flash) without any modification. The target is MPC85xx.


I don't know the details of the MPC85xx architecture, I'm only familiar with the MPC5200 architecture but I think both cases could be familiar. The U-Boot code running from flash is linker address dependent, so you can not, by example, put an image of U-Boot in a different address that it was linked and jump to it from a smaller boot. It is because you must reassign the GOT and the FIXUP sections in a similar way It's done when U-Boot is relocated in RAM.