Re: Bootloader & Flash

Hi again,

i've learned a little bit :)

- I have download the zImage.elf via the EDK flash loader
- The flash loader creates a bootloader, this is also running on start up=
 :)

But ... It stops with an error-message after a few seconds:

EDK Bootloader:
Bootloader: Processed (0x)000000b2 S-recordsERROR: SREC line is corrupted=


What now ?

Georg


MingLiu wrote:

Dear Georg,
I guess you were talking about the booting process of the system, both =

HW and the SW, from the flash memory. This process should be like this:

1. Store your HW bitstream and Linux kernel in flash memories. If neede=

d, perhaps you want another bootloader program, such as U-boot also insid=
e.=20

2. In your HW bitstream, you need one bootloader which helps you to loa=

d the software and execute it in DDR-ram. EDK helps you to generate such =
a bootloader when you design.=20

3. Durong Power on, HW bitstream (with an EDK bootloader included) will=

 be loaded into FPGA and configure the FPGA, then the EDK bootloader will=
 load your Linux kernel into DDR-Ram and execute it there. Thus your linu=
x could run.=20

This is a normal process. If you want to execute the program in flash d=

irectly, that's another story. Also you should know, for the booting proc=
ess, MTD driver is not necessary. The driver is only used when you want t=
o access flash memories when you booted your Linux kernel.

Clear or not? :)

Best Regards
Ming

----------------------------------------> Date: Wed, 7 Nov 2007 13:00:3=

5 +0100> From: g.schardt@fz-juelich.de> To: Linuxppc-embedded@ozlabs.org>=
 Subject: Bootloader & Flash>> Hi,>> i use the AVnet Xilinx4 FX12 Minimod=
ule and until now, i use system-ace> to configure the fpga and boot the l=
inux kernel.> But now, i want to boot from the on board flash memory and =
have no idea> where to start.>> I think i have to:> - save the fpga confi=
guration in the fpga-prom> - use/program some kind of bootloader store in=
 fpga block ram to jump to> the flash-adress where the executable linux k=
ernel resist> - use the mtd-device driver to mount root fs on the same fl=
ash some> address later>> Is this the right way ?>>> Regards> Georg>>>>>>=

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