RE: [microblaze-uclinux] U-boot in Bram

["A. Bose" <abose@xxxxxxxx>]

I am aware of what you are saying. 

I have 192 Kbytes of useable BRAM available (each BRAM can use 32Kbits) in
my V5LX50 (48 BRAMs) and the max size that a block ram instance can be is:
131072 bytes (128 Kbytes) according to the BRAM pcore doc.

I found that my u-boot image was about 121 Kbytes. Therefore it should fit.
I just can't figure out the how to change the start address as mentioned:

WARNING:MDT - None of the ELF files for MICROBLAZE instance microblaze_0
start
   at address 0x00000000
   If memory at start address is not initialized properly, the processor
after
   startup will run arbitrarily

Note: I want to do this because I have seen systems in the past with corrupt
Flash that prevent anything from booting,  and this is not possible to
remotely debug the problem as the hardware is not responding to Ethernet
requests.

Thanks in advance for any insight,
-A Bose

-----Original Message-----
From: owner-microblaze-uclinux@xxxxxxxxxxxxxx
[mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxx] On Behalf Of John Williams
Sent: Wednesday, February 27, 2008 6:55 PM
To: microblaze-uclinux@xxxxxxxxxxxxxx
Subject: Re: [microblaze-uclinux] U-boot in Bram

Hi A.,

A. Bose wrote:

> I was trying to put uboot-s.elf into BRAM in EDK and got this error:

This is almost impossible.  Only the very largest Virtex devices have 
sufficient on-chip BRAM to host u-boot.  u-boot requires on the order of 
128K, which is why we default to locating it at the top of external 
(DDR/SDRAM) memory.

The supported setup is

1. FSBOOT runs from BRAM on boot, which

2. launches the self-relocation u-boot-s.bin from flash, which

3. copies and launches the image.ub  kernel image

Many other options are possible, such as by-passing u-boot completely. 
However, u-boot in BRAM really isn't one of them.

Regards,

John


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