AM335x SK uboot problem

Smitha R

Other Parts Discussed in Thread: AM3352, SYSCONFIG

Hello,

I'm a fresher with only 6 months experience and now dealing with AM335x SK similar custom board. I'm using ti-sdk-am335x-evm-07.00.00.00. My board has AM3352 processor, TPS65217C PMIC. It is also has the 2GB DDR3 interfacing to processor similar to Starter kit but only difference is we have used ISSI part(IS43TR16128A-125) instead of Micron(MT41J128M16JT-125) which has similar speed bin. So i feel ddr3 configuration is OK but may be i'm wrong as i'm still a learner with very less knowledge and experience.

In u-boot/board/tiam335x/board.c, I properly changed the PMIC initialization in am33xx_spl_board_init(void) function. The sdram_init(void) initialization is also proper. Later in u-boot/arch/arm/cpu/armv7/omap-common/mem-common.c, inside the void gpmc_init(void) function it is trying to configure GPMC for NAND and it is strucked after calling this writel(0x00000008, &gpmc_cfg->sysconfig);.

Now i have two questions which has become headache from past one month is:

1. My Starter kit is properly configuring GPMC for NAND and executing the above writel and my doubt is Starter kit doesn't have Nand Flash then how this NAND configuration is taking place.

2. When Starter kit is executing this writel call, why my board is getting struck at this point.

It's almost more than a month i got struck at this point. Plz help me with my doubts asap.

Thanks,

Anil P

over 10 years ago

0 Shivasharan Nagalikar over 10 years ago

TI__Expert 8630 points

Hi Anil,

You need to verify the Timing parameters of the DDR part that you are using. Please refer to the following guide:

processors.wiki.ti.com/.../AM335x_EMIF_Configuration_tips

and also you need to carry out the Software leveling as described in the link:

processors.wiki.ti.com/.../AM335x_DDR_PHY_register_configuration_for_DDR3_using_Software_Leveling

Once you finish this and make sure the DDR is fully up and running you can check on the hang issue.

Regards,
Shiv

0 Smitha R over 10 years ago in reply to Shivasharan Nagalikar

Intellectual 790 points

Thanks for ur quick reply. I'll verify timing parameters and will carry Software levelling and can u also answer me to my question no.1. Can u plz light me some knowledge of this NAND configuration taking place in Starter kit.

Thanks,
Anil P

0 Shivasharan Nagalikar over 10 years ago in reply to Smitha R

TI__Expert 8630 points

NAND issue you see on the Custom board or the TI starter kit ?

Regards,
Shiv

0 Smitha R over 10 years ago in reply to Shivasharan Nagalikar

Intellectual 790 points

Hello Shiv,
NAND issue is with Custom Board but my question is Starter kit doesn't ve NAND flash, but why it is configuring NAND by executing #elif defined(CONFIG_NAND) function in u-boot/arch/arm/cpu/armv7/omap-common/mem-common.c.
And i dint mention that even custom board doesn't ve NAND flash.
Thanks,
Anil P

0 Shivasharan Nagalikar over 10 years ago in reply to Smitha R

TI__Expert 8630 points

Hi,

By default GPMC is also initialized I guess. If you look at the boards.cfg file .. you can see that all the am335x configs use the NAND.

Best regards,
Shiv

0 Smitha R over 10 years ago in reply to Shivasharan Nagalikar

Intellectual 790 points

Hi Shiv,
I verified my timing parameters and configured SDRAM_TIM_1, SDRAM_TIM_2 and SDRAM_TIM_3 registers. I din't perform Software levelling because my ddr3 interfacing to processor is copied from am335x starter kit and hence all parameters like clock frequency, PHY_INVERT_CLKOUT, DDR_CLK length, DDR_DQS lengths are same as starter kit.
Finally the result is same. I got struck at the function call writel(0x00000008, &gpmc_cfg->sysconfig); as mentioned in the above post. I'm running out of my time because of this issue, so the solution to this as early as possible is greatly appreciated.

Thanks,
Anil P

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AM335x SK uboot problem