i.MX Processorsのトピックimx28 DDR 256 MB 2.6.35.13 fsl

imx28 DDR 256 MB 2.6.35.13 fsl

jeanletutour — Wed, 19 Feb 2014 11:04:34 GMT

Hi there

i don't manage to configurate ltib , and linux software , to be able to see the 256 MB of ram. the system is still seeing 128 MB

has anybody had this problem ?

thanks

Re: imx28 DDR 256 MB 2.6.35.13 fsl

Yuri — Thu, 20 Feb 2014 03:18:35 GMT

Generally (for DRAM initialization when stand alone applications are debugged)

one can use the DDR tool, mentioned under item 3. below.

But often customers need to adapt Freescale BSP(s) for their boards.

https://www.freescale.com/webapp/Download?colCode=L2.6.35_1.1.0_ER_SOURCE&appType=license&location=null

Please look at the following hints how to change i.MX28 DDR seetings in Linux.

1. DDR initialization.

I.MX28 DRAM system under Linux is initialized in bootlets.

Source codes are located in

<ltib>/rpm/BUILD/imx-bootlets-src/boot_prep/init-mx28.c

To get it, please use the next commands

./ltib -m prep -p imx-bootlets-src

After editing :

./ltib -m scbuild -p imx-bootlets-src

./ltib -m scdeploy -p imx-bootlets-src

2. Linux kernel.

The following kernel files contain support for Linux CPUFREQ (frequency

scaling) feature :

<ltib>/rpm/BUILD/linux-2.6.31/arch/arm/mach-mx28/emi_settings.c

<ltib>/rpm/BUILD/linux-2.6.31/arch/arm/mach-mx28/emi.S

3. Tools.

Please use the tool, linked below, to get optimal settings for Your SDRAM :

Board_bring-up_and_DDR_initialization_tools :

https://community.freescale.com/docs/DOC-1455

To apply the MFG tool for firmware update, please use option Build mfg firmware

under LTIB. It builds special Linux version, that is intended to be loaded by the MFG tool

to SDRAM of a target system and interface with the MFG in order to get target

images and write them to SD or NAND. This version is based on the same DRAM

settings as the main one.

Also please look at section 2.5 (Building the Manufacturing Firmware) of the

"i.MX28_Linux_BSP_UG.pdf."

After LTIB completes the build, updater.sb, updater_ivt.sb, and

initramfs.cpio.gz should be created.

File updater_ivt.sb and initramfs.cpio.gz should be located in

<Mfgtools>\Profiles\MX28 Linux Update\OS Firmware\

Files imx28_ivt_linux.sb, imx28_ivt_uboot.sb (if needed), and rootfs.tar.bz2

should be located in

<Mfgtools>\Profiles\MX28 Linux Update\OS Firmware\files\

5. Process for updating Linux DRAM configuration :

- please use the mentioned DDR initialization tool to get optimal settings for

the SDRAM ;

- update all the required parameters in the file init-mx28.c, based on tools

results ;

- update all the required parameters in the file emi_settings.c, based on tools

results ;

- rebuild the kernel, bootloader, and mfg firmware.

- copy updater_ivt.sb, imx28_ivt_linux.sb, initramfs.cpio.gz, and rootfs.tar.bz2

to proper directories of the MFG tool.

Re: imx28 DDR 256 MB 2.6.35.13 fsl

jeanletutour — Fri, 21 Feb 2014 16:04:34 GMT

if tried what you said

./ltib -m prep -p imx-bootlets-src

After editing :

./ltib -m scbuild -p imx-bootlets-src

./ltib -m scdeploy -p imx-bootlets-src

I did not modify anything but it happened that now the system try to boot in mDDR instead of DDR2 and dont work anymore anymore .do you know why ??

Then i came back to old version of VM that i had stored : what i want to do is to change kernel command line ( add mem=256K ) . if tried to change the four bootstream line in ltib but when i build on a sdcard , modification does not appears .

do you know why ??

thanks

Re: imx28 DDR 256 MB 2.6.35.13 fsl

Yuri — Mon, 02 Jun 2014 03:40:15 GMT

Memory initialization and size are configured in bootlets ; available kernel command line parameters are
described in section 5.1.1 (Setting Up Kernel Command Line) of "MX28_EVK_Linux_User_Guide.pdf".

Have a great day,
Yuri

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