OMAPL137 EVM: dumb question EMIFA Nand Flash driver

Hi Ming,

Welcome to the TI E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages. Be sure to search those for helpful information and to browse for the questions others may have asked on similar topics.

Actually, there already exist a ready made "DA830 - USER INTERFACE MODULE" with flashes (NOR/NAND) and LCD from Spectrum Digital which interface through EMIF-A Expansion of OMAP-L137 EVM .

http://support.spectrumdigital.com/boards/assy511240/revc/ . The NAND driver is already available in Davinci PSP. when UI card from ( SDI )is connected, we have to just enable the NAND support while configuring the kernel as given below.

NAND 

 

System Type  --->
    [*] DA830/OMAP-L137 UI (User Interface) board support
        Select DA830/OMAP-L137 UI board peripheral --->
            (X) NAND flash

Device Drivers --->

    Character devices  ---> 
        < > DA830/OMAP-L137 Character LCD Support

    Graphics support  --->
        < > Support for frame buffer devices

    Memory Technology Devices (MTD)  --->
    [*]     Command line partition table parsing
        NAND Flash Device Drivers  ---> 
            <*> NAND Device Support 
            <*> NAND Flash device on DaVinci SoC 

For more details you can refer to http://processors.wiki.ti.com/index.php/Using_Linux_PSP_on_OMAP-L1#NAND

If you are very particular in using the "nand flash test board" designed by you, you can have this nand driver of Davinci PSP

as a reference to start with your own to support your test board. 

Please let us know how it goes and whether you succeeded.

Regards,

Shankari

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Hi Shankari,

Thank you for your reponse!

My test board is not particular actually. It's just a small board with a TSOP48 socket on it and can connect to the EMIF-A Expansion of OMAP-L137 EVM. I put a Micron 8-bit Nand Flash in the socket and want to access the flash with OMAPL137. This is basically my task.

Is the link "http://support.spectrumdigital.com/boards/assy511240/revc/" for OMAPL137? I couldn't find any driver code on it...

And one last stupid question: what is the UI card?

Thank you for your help and patience!

Ming

Hi Ming,

Ming Says said:

Is the link "http://support.spectrumdigital.com/boards/assy511240/revc/" for OMAPL137? I couldn't find any driver code on it...

And one last stupid question: what is the UI card?

That is the link for the "User Interaface module" of OMAP-L137 ( EVMOMAP-L137 and DSKDA830 are equivalent :--  OMAP-L137 processor is used) designed by SDI. In that weblink, you can download the schematics of the userinterface module which includes NAND flash too.

UI card is nothing but the User interface card.

The Davinci PSP linux ( which includes NAND driver ) was already tested on OMAP-L137 EVM ( DA830 EVM ) with UI card connected. You can take that driver code as a reference.

In addition to that, you will find some test code as BSL ( Board support library ) downloadable from SDI website " http://support.spectrumdigital.com/boards/evmomapl137/revg/." in the name of "revg_EVMOMAPL137_BSL.zip" (EVMOMAPL137 Test Code) in which you will find some configuration code for Async-EMIF .

There is a BSP package available for OMAP-L137. http://processors.wiki.ti.com/index.php/AM17x/OMAP-L137_WinCE_BSP_Quick_Start_Guide. please do check for NAND support and it's source code.

Regards,

Shankari.

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Hi Shankari,

Thank you! I'm now trying to follow your instruction to configure the kernel to enable the nand driver, also by following the section "Driver Configuration in Linux Kernel" of the page http://processors.wiki.ti.com/index.php/Using_Linux_PSP_on_OMAP-L1#NandFlashNotPresentOnOmapL137EVM

But the section says:

For configuring the Linux kernel, run the following commands:

make da830_omapl137_defconfig ARCH=arm CROSS_COMPILE=arm_v5t_le-
make menuconfig ARCH=arm CROSS_COMPILE=arm_v5t_le-

I'm wondering on which directory I should run the commands? I've had all these software installed, but can't run such commands. It prompt: "No rule to make target ..."

And one more question, I'm also trying to locate the nand driver code from the DaVinci-PSP-SDK-03.20.00.12, I'm not pretty sure... May you help me point out?

Thank you very much!

Hi Ming,

Ming said:

I'm wondering on which directory I should run the commands? I've had all these software installed, but can't run such commands. It prompt: "No rule to make target ..."

You have to run these commands being at the directory which has Linux kernel Source files.

 host$ cd linux-xx.xx.xx.xx
 

In that directory, you will find a makefile to run the "make" commands; Otherwise, you will receive this error like "No rule to make target"e.t.c.,

And also, if you haven't built the u-boot ever once, you have to build it first before building linux as it generates the "mkimage" under the tools folder of U-Boot source which in turn is required for linux build.These informations are given in detail at the following links.

http://processors.wiki.ti.com/index.php/Building_03.22_PSP_release_Components_for_OMAP-L138#Preparing_your_Environment

http://processors.wiki.ti.com/index.php/GSG:_Building_Software_Components_for_OMAP-L1#Rebuilding_U-Boot

Ming said:
 And one more question, I'm also trying to locate the nand driver code from the DaVinci-PSP-SDK-03.20.00.12, I'm not pretty sure... May you help me point out?

Being in linux directory if you give search commands like

"../DaVinci-PSP-SDK-03.22.00.02/src/kernel/linux-03.22.00.02$ find . -iname *nand*"

It will show up all the nand related codes. (e.g., ./include/linux/mtd/ and ./drivers/mtd/nand e.t.c., ) contained in it

Or you can directly go to this folder and find the NAND driver. " ../../DaVinci-PSP-SDK-03.22.00.02/src/kernel/linux-03.22.00.02/drivers/mtd/nand$ "

Regards,

Shankari

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Hi Shankari,

Thank you for your instructions! I ordered the user interface module from Spectrum and connected it to the EVM. It looks neat. I also configured the kernel image according to the wiki page to enable the Nand flash. In booting, it shows:

Creating 4 MTD partitions on "nand_davinci.0":
0x00000000-0x00020000 : "bootloader"
0x00020000-0x00040000 : "params"
0x00040000-0x00240000 : "kernel"
0x00240000-0x20000000 : "filesystem"
nand_davinci nand_davinci.0: hardware revision: 2.5
Creating 3 MTD partitions on "Windbond spi nand flash":
0x00000000-0x00040000 : "U-Boot"
0x00040000-0x00044000 : "U-Boot Environment"
0x00044000-0x00400000 : "Linux"

May you suggest me what should I do next, or tell me where can I find more about nand support, like how to access the nand flash?

Thank you very much!

Ming