DM3730 NOR Flash Booting u-boot

Paul Hoffmeyer

Other Parts Discussed in Thread: DM3730

Hi,

We're designing an embedded system with DM3730. We have 64 Mb NOR flash (PC28F640P30BF65), and 2 Gb RAM. Nor flash configured as multiplexed on CS0, CUS package.

We are using dvsdk_dm3730-evm_04_03_00_06_setuplinux (with u-boot-2010.06-psp04.02.00.07.sdk and x-load-1.51-psp04.02.00.07.sdk).

After looking at previous posts we reviewed U-boot-AM3517-NOR-Flash-Support-04.02.00.06.tar.gz file and made some changes based on this.

We've tested the NOR flash using GEL files but when we load u-boot into RAM and run it we can't see or access the NOR device on CS0 any longer.

Is there another patch file we should be using to get NOR access in u-boot?

over 10 years ago

0 Cvetolin Shulev-XID over 10 years ago

TI__Guru 65405 points

Hi Paul,

I would like to ask you whether you have added the following patch:

http://tiprocessors.com/index.php/File:U-boot-AM3517-NOR-Flash-Support.tar.gz

The changes of configuration which the patch makes refers to AM3517EVM PC28F640P30B85 Flash which seems very similar to your environment.

Tsvetolin Shulev

0 Paul Hoffmeyer over 10 years ago in reply to Cvetolin Shulev-XID

Prodigy 40 points

Hi Tsvetolin,

Thanks for the quick reply. We've applied the patch. We did make changes to STNOR_GPMC_CONFIGx values to match our settings when tested with the GEL file. We've tried with both default and our values but are still not able to access the NOR flash.

Paul

0 Paul Hoffmeyer over 10 years ago in reply to Paul Hoffmeyer

Prodigy 40 points

Hi Tsvetolin,

After making changes to the GPMC configuration settings in u-boot we are able to get u-boot to run from RAM and to write the u-boot image into the NOR at address 0x08000000. We are unable to boot from NOR. It seems like the ROM boot is finding u-boot because the boot sequence does not continue but u-boot is not executing. If we change the GPMC configuration settings to the default settings (boot settings) then we can not reliable read or write to the NOR. The TRM has a caution note on page 2118 about using internal boot code to change CS0 configuration before the first CS0 access but says it is only necessary for two external devices which we are not using. Does the internal boot code for the DM3730 need to be modified to boot from our NOR flash?

Paul

0 Cvetolin Shulev-XID over 10 years ago in reply to Paul Hoffmeyer

TI__Guru 65405 points

Hi Paul,

The internal boot code for the DM3730 is not public and could not be modified.

You can get the last sources and patches of the TI's u-boot branch from:

http://git.denx.de/?p=u-boot/u-boot-ti.git;a=summary

There you could search for some patches related to NOR support.

BR
Tsvetolin Shulev

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DM3730 NOR Flash Booting u-boot