How to disable memory channel 2?

[CY C]

Hello All,

 

I want to disbable memory channel 2 (emif2), I have tried to modify emif.h(/android3.0/arch/arm/mach-omp2/include/mach),but it can't work properly.

Any one can tell me how to configuration?

 

Platform : TI Pandaboard 4460

software : 4AI.1.7 OMAP4 Icecream Sandwich

 

Regards

CYC

[alexandre bailon]

Hello

I'm not sure you can do it in kernel (by default, interleaving is enabled). I think you must do it in bootloader. 

In u-boot (2013.04), you must do it in arch/arm/cpu/armv7/omap-common/emif-common.c.

Regards,

Alexandre Bailon

[CY C]

Hello Alexandre Bailon,

 

In u-boot, I have modified interleaving mode and platform can boot correctly.

But when Android system is initialized, the initialization message always indicates system reboot.

So, I think maybe Android also need to be modified EMIF configuration.

 

Regards

CYC

 

 

 

 

 

在 2013年8月28日星期三UTC+8下午1时57分14秒，alexandre bailon写道：

[alexandr...@gmail.com]

> But when Android system is initialized, the initialization message always indicates system reboot.

Can you send the logs ??

> So, I think maybe Android also need to be modified EMIF configuration.

Android (and kernel) should not be aware about interleaving. 

Have you only disable interleaving or have you also disable channel ?

The kernel should expect your board have 1GB of memory. But if channel is disabled, only 512MB are available.

u-boot can provide memory using atags, or it may be defined in kernel command line.

May be you have to update mapping in DMM? By default, there is 2 section of 512MB. I don't remember how DMM is working but I think it map ARM memory address to EMIF1 and EMIF2 memory address. If channel two is disabled, it can make problem.

regards

2013/8/29 CY C <chiou.c...@gmail.com>

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