Hi,
On Fri, Oct 31, 2008 at 03:05:14PM +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
aswell.
>
> 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.
>
> Q>> Is this correct?
>
> I have also commented some lines in nand_get_flash_type which checks the
> Manf./device ID again!
>
> Once modified, I loaded the image to the RAM location 0xa7f00000 and
> executed. I get the following output.
>
> **************************************************************************************************************
> U-Boot 2.0.0-rc5-git (Oct 31 2008 - 09:03:01)
>
> Board: Freescale i.MX27 ADS
> cfi_probe: cfi_flash base: 0xc0000000 size: 0x02000000
> NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron NAND 256MiB 3,3V
> 8-bit)
> Scanning device for bad blocks
> Using environment in NAND Flash
> chip id: [1,882,1,01d]
> mpll: 398999390 Hz
> spll: 239999725 Hz
> arm: 398999390 Hz
> perclk1: 29555510 Hz
> perclk2: 26599959 Hz
> perclk3: 66499898 Hz
> perclk4: 26599959 Hz
> clkin26: 26000000 Hz
> ahb: 132999796 Hz
> ipg: 66499898 Hz
> Malloc space: 0xa7b00000 -> 0xa7f00000 (size 4 MB)
> Stack space : 0xa7af8000 -> 0xa7b00000 (size 32 kB)
> envfs: wrong magic on /dev/env0
> no valid environment found on /dev/env0. Using default environment
> running /env/bin/init...
> Usage:
> adds a partition table to a device
>
> Hit any key to stop autoboot: 3
>
> type update_kernel [<imagename>] to update kernel into flash
> type udate_root [<imagename>] to update rootfs into flash
>
> uboot:/
Can you access the NAND device? Before trying to boot from the device
should make sure that it works using normal U-Boot commands.
> **********************************************************************************************************************
>
> 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?
> 2. How can I reduce the frequency of operation through uboot?
No.
> 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.
> 4. How can I introduce more delay between each NAND operation?
You don't have udelay in this stage, so your only chance is to insert
busy loops.
Regards,
Sascha
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