[U-Boot-Users] moving u-boot to upper address

[VanBaren, Gerald (AGRE)]

HRCW is ALWAYS at the START of your flash (assuming your flash is less than 16MB -- in that case, it is at 0xfe000000).  The HRCW will be at 0xfff00000 ONLY if your flash is exactly 1MB.

Strictly speaking, the HRCW does not have any address: the processor asserts CS0 and reads the HRCW from offsets 0..31 in whatever memory is enabled when CS0 is asserted.  It isn't until OR0/BR0 is configured (which is part of what is controlled by the HRCW) that you can talk about addresses.

gvb


> -----Original Message-----
> From: u-boot-users-admin at lists.sourceforge.net
> [mailto:u-boot-users-admin at lists.sourceforge.net]On Behalf Of
> mblack at mantaro.com
> Sent: Friday, July 09, 2004 8:46 AM
> To: u-boot-users at lists.sourceforge.net
> Subject: [U-Boot-Users] moving u-boot to upper address
>
>
> I want u-boot to live in the upper boot area 0xfff00000.
>
> So I have
>
> undef'd  _BOOT_LOW
> changed TEXT_BASE to be 0xfff00000
> changed CFG_MONITOR_BASE to be TEXT_BASE
>
> I realize that the HRCW will now be placed at 0xfff00000 and
> the actual
> code will begin at 0xfff00100 - this is okay, I will handle the HRCW
> seperatly.
>
> I just want to know if there is anything wrong with what I
> have done or if
> there is anything else I need to do?  There are, as you know, many
> dependancies and I am afraid I might have missed one.
>
> I am dealing with custom hardware and I don't have a hardware
> debugger -
> lots of flash and crash so I am not exactly sure where my problem is.
>
> Thanks!
>
> Mitch
>
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