[U-Boot-Users] Flash vs DataFlash vs NAND Flash

[U-Boot-Users] Flash vs DataFlash vs NAND Flash

[Matt Gessner]

Hi, all,

On my AT91RM9200 board, I have an Atmel DataFlash for booting off my
SPI, and I have a NAND flash.

I do not, however, have any other kind of flash.

My 128K DataFlash address is 0xc0000000, and my 128MB of RAM is at
0x20000000.

When I do 

	cp.b 20200000 c0000000 2c60

	Copy to DataFlash... done

it works just fine.

When I do

	cp.b c0000000 20200000 2c60

the system crashes with a data abort, but before the crash, it reports

	Copy to Flash...

Well, I'm quite confused how to set the various flash flags to make all
this work.

If I try to set CFG_NO_FLASH, the system won't compile.

But there is no "conventional" flash on the board... just the nand
(8-bit port) and dataflash (spi).  

Would someone kindly point me to a reference that explains how I can set
up u-boot 1.2.0 to make this work?  Or just come straight out and tell
me?

Thanks in advance,

Regards,

Matt Gessner

[U-Boot-Users] Flash vs DataFlash vs NAND Flash

[Jerry Van Baren]

Matt Gessner wrote:
> Hi, all,
> 
> On my AT91RM9200 board, I have an Atmel DataFlash for booting off my
> SPI, and I have a NAND flash.
> 
> I do not, however, have any other kind of flash.
> 
> My 128K DataFlash address is 0xc0000000, and my 128MB of RAM is at
> 0x20000000.
> 
> When I do 
> 
> 	cp.b 20200000 c0000000 2c60
> 
> 	Copy to DataFlash... done
> 
> it works just fine.
> 
> When I do
> 
> 	cp.b c0000000 20200000 2c60
> 
> the system crashes with a data abort, but before the crash, it reports
> 
> 	Copy to Flash...
> 
> Well, I'm quite confused how to set the various flash flags to make all
> this work.
> 
> If I try to set CFG_NO_FLASH, the system won't compile.
> 
> But there is no "conventional" flash on the board... just the nand
> (8-bit port) and dataflash (spi).  
> 
> Would someone kindly point me to a reference that explains how I can set
> up u-boot 1.2.0 to make this work?  Or just come straight out and tell
> me?
> 
> Thanks in advance,
> 
> Regards,
> 
> Matt Gessner

 From the last message before the crash, it looks like you have 
non-existent "flash" configured in the memory space where your RAM 
resides, so the second cp.b tries to do the NOR flash "song & dance" to 
"unlock" it.  Of course, this writes trash into your SDRAM which crashes 
your program.

1) Find where NOR flash in configured for your board/cpu/system and
      fix it.
2) Figure out why CFG_NO_FLASH causes your compile to break.  You
      apparently have an inadvertent dependency, or NAND flash requires
      it (I don't have any experience with NAND flash or ARM(r)
      processors)

Fixing #1 may fix #2.  Finding #2 may point to where #1 is broken.

HTH,
gvb

[U-Boot-Users] Flash vs DataFlash vs NAND Flash

[Ulf Samuelsson]

> Matt Gessner wrote:
>> Hi, all,
>>
>> On my AT91RM9200 board, I have an Atmel DataFlash for booting off my
>> SPI, and I have a NAND flash.
>>
>> I do not, however, have any other kind of flash.
>>
>> My 128K DataFlash address is 0xc0000000, and my 128MB of RAM is at
>> 0x20000000.
>>
>> When I do
>>
>> cp.b 20200000 c0000000 2c60
>>
>> Copy to DataFlash... done
>>
>> it works just fine.
>>
>> When I do
>>
>> cp.b c0000000 20200000 2c60
>>
>> the system crashes with a data abort, but before the crash, it reports
>>
>> Copy to Flash...
>>
>> Well, I'm quite confused how to set the various flash flags to make all
>> this work.
>>
>> If I try to set CFG_NO_FLASH, the system won't compile.
>>
>> But there is no "conventional" flash on the board... just the nand
>> (8-bit port) and dataflash (spi).
>>
>> Would someone kindly point me to a reference that explains how I can set
>> up u-boot 1.2.0 to make this work?  Or just come straight out and tell
>> me?
>>


Why not use U-Boot 1.1.5 from 
ftp://at91dist:distrib at 81.80.104.162/U-Boot-1.1.5   ?
That has probably got later patches for the AT91RM9200 than 1.2.0

Best Regards
Ulf Samuelsson 

[U-Boot-Users] Flash vs DataFlash vs NAND Flash

[Matt Gessner]

Um... I wasn't aware that an earlier version of u-boot would have better
support than 1.2.0.

I'll check into it.

One of the reasons I wanted 1.2.0 was that it had NAND flash support for
very large NAND flash devices.

I'll check it out.

Matt

> -----Original Message-----
> From: Ulf Samuelsson [mailto:ulf at atmel.com]
> Sent: Thursday, March 22, 2007 6:40 PM
> To: Jerry Van Baren; Matt Gessner
> Cc: u-boot-users at lists.sourceforge.net
> Subject: Re: [U-Boot-Users] Flash vs DataFlash vs NAND Flash
> 
> > Matt Gessner wrote:
> >> Hi, all,
> >>
> >> On my AT91RM9200 board, I have an Atmel DataFlash for booting off
my
> >> SPI, and I have a NAND flash.
> >>
> >> I do not, however, have any other kind of flash.
> >>
> >> My 128K DataFlash address is 0xc0000000, and my 128MB of RAM is at
> >> 0x20000000.
> >>
> >> When I do
> >>
> >> cp.b 20200000 c0000000 2c60
> >>
> >> Copy to DataFlash... done
> >>
> >> it works just fine.
> >>
> >> When I do
> >>
> >> cp.b c0000000 20200000 2c60
> >>
> >> the system crashes with a data abort, but before the crash, it
reports
> >>
> >> Copy to Flash...
> >>
> >> Well, I'm quite confused how to set the various flash flags to make
all
> >> this work.
> >>
> >> If I try to set CFG_NO_FLASH, the system won't compile.
> >>
> >> But there is no "conventional" flash on the board... just the nand
> >> (8-bit port) and dataflash (spi).
> >>
> >> Would someone kindly point me to a reference that explains how I
can
> set
> >> up u-boot 1.2.0 to make this work?  Or just come straight out and
tell
> >> me?
> >>
> 
> 
> Why not use U-Boot 1.1.5 from
> ftp://at91dist:distrib at 81.80.104.162/U-Boot-1.1.5   ?
> That has probably got later patches for the AT91RM9200 than 1.2.0
> 
> Best Regards
> Ulf Samuelsson

[U-Boot-Users] Flash vs DataFlash vs NAND Flash

[Ulf Samuelsson]

Um... I wasn't aware that an earlier version of u-boot would have better
support than 1.2.0.

I'll check into it.

One of the reasons I wanted 1.2.0 was that it had NAND flash support for
very large NAND flash devices.

I'll check it out.

Matt

==> I think you should download the Atmel 1.1.5
        create a diff vs vanilla 1.1.5 and then reapply on top of 1.2.0
        This way, you make sure that you have the latest Atmel stuff
        AND the  latest generic stuff.



Best Regards
Ulf Samuelsson                ulf at atmel.com
Atmel Nordic AB
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