Significance of address 0x26f00000

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aniket1
Posts: 2
Joined: Mon Aug 01, 2016 10:17 am

Significance of address 0x26f00000

Wed Sep 07, 2016 6:36 am

I am using SAMA5D22 device and using bootloader derived from AT91 bootstrap.
The bootstrap copies application from address 0x4000 of spi-flash to DDRAM2 at address 0X26F00000.
It copies the application size of 3Mbytes.

If the address of 0X26F00000 is changed to 0X20000000, it works fine.

If the application size of 3Mbytes is increased to 3.5Mbytes, the bootloader works only with address 0X26F00000 and not with any other address. What i mean by not works is the data copied is corrupted.

So, my question is what is the significance of the address 0X26F00000 ? or it is just a random location?

Thanks in advance.
blue_z
Location: USA
Posts: 1507
Joined: Thu Apr 19, 2007 10:15 pm

Re: Significance of address 0x26f00000

Thu Sep 08, 2016 1:36 am

aniket1 wrote:What i mean by not works is the data copied is corrupted.
That's a conclusion by you that does not add an iota of information.
aniket1 wrote:So, my question is what is the significance of the address 0X26F00000 ?
This address should match the start address of the loaded program.
aniket1 wrote: ... or it is just a random location?
Atmel choose this address to locate U-Boot in memory.
It used to be 0x23F00000 for legacy AT91SAM9 devices using U-Boot v1.1.5.

Regards
aniket1
Posts: 2
Joined: Mon Aug 01, 2016 10:17 am

Re: Significance of address 0x26f00000

Thu Sep 08, 2016 11:37 am

Thanks for your reply.
So, can i use address 0x20000000?
blue_z
Location: USA
Posts: 1507
Joined: Thu Apr 19, 2007 10:15 pm

Re: Significance of address 0x26f00000

Fri Sep 09, 2016 1:43 am

aniket1 wrote:So, can i use address 0x20000000?
Yes.

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