On Fri, Oct 31, 2008 at 07:35:42PM +0530, Tiju wrote:
> Hi Sascha,
>
>
> > >
> > > The Nand port to imx27ads is booting when I use a Samsung device (128MiB,
> > 3.3V, 8-bit, 512page).
> >
> > Great! Care to send patches? That would help answering further questions
> > as well..
>
> Sorry, I know its a basic question but how do I make a patch file? Else I can
> send you the file I modified.
>
> > > Now my requirement is to boot from a Micron device (256MiB, 3.3V, 8-bit,
> > > 2k
> > page). Part num: MT29F2G08AAD
> > >
> > > I modified the line in imx27ads.c to
> > >
> > > imx_nand_load_image((void *)TEXT_BASE, 256 * 1024, 2048, (2048 * 64));
> > //256MB, 2K
> >
> > I don't know your NAND chip, so I can't say anything about the block
> > size, but otherwiese it looks correct.
>
> Thanks. I have verified that the block size is correct.
>
> > Can you access the NAND device? Before trying to boot from the device
> > should make sure that it works using normal U-Boot commands.
>
> The only command related to the nand flash when I type help is "nand". Could
> you please tell me some commands to read and write the nand that would work
> from the uboot prompt? Where could I find more info on this?
Well the trick is that There are no other commands for nand. When the NAND
device is initialized you should have a /dev/nand0. From there on you
can partition the device using addpart, for example like this:
addpart /dev/nand0 256k(uboot),256k(ubootenv),2M(kernel),-(root)
This gives you the partition devices /dev/nand0.uboot and so on. You
then add bad block aware devices ontop of these partitions:
nand -a /dev/nand0.*
You can use the standard commands like erase / cp / md on these devices.
>
> > > But once I program the uboot image to the micron flash, nothing seems to
> > appear on the UART. I am using the Ronetix PEEDI JTAG programmer.
> > >
> > > 1. Is there anything/anywhere else I should modify the uboot code for the
> > micron nand flash to boot?
> >
> > I think not, but then again, it would work, right?
>
> I went through the code and could find only this to be modified. I am worried
> weather there are any timing related differences between the samsung and the
> micron.
>
> >
> > > 2. How can I reduce the frequency of operation through uboot?
> >
> > No.
> You mean the frequency cannot be reduced?
Oh, I overread the 'how'. No, it cannot be reduced through U-Boot
commands. You either have to adjust a lower frequency in the startup
code or add a command that does the trick for you.
>
> > > 3. If I do single stepping, it seems that the first 2k data is being
> > > copied
> > successfully from the SRAM to the DDR. But if I execute/give a "go" nothing
> > appears on the UART, but PC=0x00000004.
> >
> > Place a breakpoint after the first 2k are copied and single step
> > further.
>
> It looks if I single step all the 2K bytes are copied to DDR. But if I just
> execute, in the 2K everything copies except the first 512bytes.
Sorry, I'm afraid I can't help you here without access to the hardware.
But it will give some hints if you can verify that the NAND is working
in general under U-Boot (or under Linux, which basically is the same
driver)
Regards,
Sascha
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