[U-Boot] FSBBP: uboot Programming on to the flash for MPC8548 for bootup

[Andy Fleming]

On Wed, Aug 27, 2008 at 12:16 AM, Ajeesh Kumar <ajeesh at tataelxsi.co.in> wrote:
> hi sir/madam,
>
> I'm using a MPC8548E processor(power pc) also, i've interfaced a nor flash
> of 128 MB to the processor.
> i've read few documents and got to know that the uboot.bin should be
> programmed at 0xfff80000.
> Also, when i saw the uboot.bin size it was 512K. so, it could fit between
> 0xfff80000 - 0xffffffff.
> I 'M USING ABATRON BDI2000/BDI3000 FOR THIS.
> Now my question is:
> 1) If i'm making changes(addition/deletion of code) to the bootloader(uboot
> 1.2) and re compile it, i believe that the size of the uboot.bin will get
> changed i.e >/< 512K. NOW AT WHICH LOCATION I SHOULD FLASH THE
> UBOOT.BIN(SIZE IS NOT EQUAL TO 512)
> FOR Eg.  If my uboot.bin size is >512K ?????


Well, it's not likely you will change the size of the binary.  You
see, the 512K size is a result of a quirk of the 85xx platform.  The
reset vector is at 0xfffffffc, but we define the base address to be
0xfff80000, so we fill in the space between, and it's 512K.

The result is, you don't need to mind the size, unless you grow the
compiled output by over 200K.  Try to avoid that ;)

Andy