[U-Boot] why u-boot relocate it self to RAM from flash?

[Wolfgang Denk]

Dear tejas patel,

In message <CAPWFgSA88DJF_Jm9MKTu53kpiNb7kqNcnuG6EDbA_W1MfHZO9Q at mail.gmail.com> you wrote:
>
> I can not understand why u-boot relocate it self to RAM from flash? Why is
> it not executing from flash?
> Can anybody explain.

There is a ton of reasons.  One is that you cannot erase or program
the flash device and execute code from it at the same time, so we
would not be able to write a Linux kernel image - at least not without
special flash drivers that execute from RAM.  And we would not be able
to update the U-Boot image in flash. etc. etc.

In the end it is much easier to run from RAM.

Best regards,

Wolfgang Denk

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