Custom IMX28 board, no boot

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Custom IMX28 board, no boot

Jump to solution
14,923 Views
dgotfroi
Contributor IV

Hello,

I design my own board with an imx28 CPU. I configured the board (resistors on LCD_D0 to LCD_05) to boot on SSP0 (SD card).

When I try to boot without SD card connected, I have the 0x8020a014 error code on the debug console. So it seems it want to boot on Sd card. So it's good.

But when I connect the SD card, I have absolutely nothing on the debug console.

I measured voltage and everything is good except VDD4P2. It equal to 0.8V !!!!!

This is the schematic :

Capture.PNG.png

Can you help me ?

Labels (1)
Tags (2)
0 Kudos
Reply
1 Solution
8,621 Views
dgotfroi
Contributor IV

In order to close this topic, please find attached my patch for VDD5V Only and the patch for my DDR2 (Samsung K4T51163QQ-BCE7).

Finaly, these patchs are very simple.

To explain what my patches do :

In spl_power_init.c, I set DROPOUT_CTRL (in HW_POWER_DCDC4P2 register) to "DcDc Converter power source is DCDC_4P2 regardless of BATTERY voltage" instead of "DcDc converter selects either VDD4P2 or BATTERY, which ever is higher."

In spl_mem_init.c, I set CS_MAP (in HW_DRAM_CTL29 register) to 1 instead of 16 (?) and I set EIGHT_BANK_MODE (in HW_DRAM_CTL31 register) to "Memory devices have 4 banks" instead of "Memory devices have 8 banks".

In mx28evk.h, I set "define PHYS_SDRAM_1_SIZE" to 0x04000000 (64MB) instead of 0x40000000 (1GB).

Now, everything is fully stable. After 200 loops of 30MB test with memtester I have 0 error. All the supply from the IMX a solid and with a correct voltage.

Many thanks for all your help during these 3 months. This is the culmination :).

View solution in original post

0 Kudos
Reply
74 Replies
8,622 Views
dgotfroi
Contributor IV

In order to close this topic, please find attached my patch for VDD5V Only and the patch for my DDR2 (Samsung K4T51163QQ-BCE7).

Finaly, these patchs are very simple.

To explain what my patches do :

In spl_power_init.c, I set DROPOUT_CTRL (in HW_POWER_DCDC4P2 register) to "DcDc Converter power source is DCDC_4P2 regardless of BATTERY voltage" instead of "DcDc converter selects either VDD4P2 or BATTERY, which ever is higher."

In spl_mem_init.c, I set CS_MAP (in HW_DRAM_CTL29 register) to 1 instead of 16 (?) and I set EIGHT_BANK_MODE (in HW_DRAM_CTL31 register) to "Memory devices have 4 banks" instead of "Memory devices have 8 banks".

In mx28evk.h, I set "define PHYS_SDRAM_1_SIZE" to 0x04000000 (64MB) instead of 0x40000000 (1GB).

Now, everything is fully stable. After 200 loops of 30MB test with memtester I have 0 error. All the supply from the IMX a solid and with a correct voltage.

Many thanks for all your help during these 3 months. This is the culmination :).

0 Kudos
Reply
3,642 Views
graemeruss
Contributor II

Hi Damien,

I'm going to keep my U-Boot patch mostly as-is for a few reasons:

- The patch disables battery voltage measurement when there is no battery

- The patch disables all code paths relating to booting from battery

- The power block configuration is based primarily on the Fressscale bootlets which I think should be retained unless we can come up with some pretty clear and convincing arguments as to why an alternative approach is better


I think there is scope for some refactoring of the power block setup code in U-Boot, but for now I think it best to leave it as close to the bootlet code sequence as practical

0 Kudos
Reply
3,642 Views
graemeruss
Contributor II

Change of plan...

I've confirmed Damien's patch works on the board I am developing for, so I will make the bare minimum of changes (i.e. Damien's patch). The rest can be worked on later

0 Kudos
Reply
3,642 Views
fabio_estevam
NXP Employee
NXP Employee

Just would like to mention that Graeme/Damien's patch for 5V only operation has been applied:

http://git.denx.de/?p=u-boot.git;a=commitdiff;h=7a086037071401ee781425c382846dddfe80df68;hp=950eaf62...

Regards,

Fabio Estevam

0 Kudos
Reply
3,642 Views
fabio_estevam
NXP Employee
NXP Employee

Hi Damien,

That's great news :-) Glad to know your board is stable now.

Just to make sure I understood:

1. You only need to apply VDD5V_Only_Uboot.patch.zip in spl_power_init.c. The previous   VDD5V_Only_Uboot_2014.patch.zip  that you posted on January, 6th is no longer needed. Is that correct?

2. About the second patch: you could let DDR settings inside spl_mem_init.c untouched and then rewrite CTL29 and CTL31 using mxs_adjust_memory_params(). Please check board/bluegiga/apx4devkit/spl_boot.c as a reference.

Regards,

Fabio Estevam

0 Kudos
Reply
3,642 Views
dgotfroi
Contributor IV

Hi Fabio,

1 . About the patch posted  on January, 6th, you can simply delete it, and empty your recycle bin :smileyhappy:. It generate DDR errors (I searched a long time in spl_mem_init to find why my DDR was not stable, but it was not a DDR configuration mistake, but a power mistake caused by my patch).

2. Perfect, many thanks for this advice.

0 Kudos
Reply
3,644 Views
dgotfroi
Contributor IV

Hello,

I've finally managed to start U-Boot 2015.01-rc2 on my own board with VDD5V only.

I will now fix every little mistake then clean my code and post my patch.

But I still have two little problems.

1. U-Boot detects only 64Mib instead of 512Mib. This is my "include/configs/mx28_evk.h" file :

#define CONFIG_NR_DRAM_BANKS 4 /* 4 bank of DRAM */

#define PHYS_SDRAM_1 0x40000000 /* Base address */

#define PHYS_SDRAM_1_SIZE 0x20000000 /* 512 MB */

2. duart_tx don't work. When I have the message "Hit any key to stop autoboot:", I can press any key, U-boot launch autoboot.

I tried with a non-modified U-boot 2015.01-rc2 on mx28evk and the problem is also there. So I think is a problem on the U-boot code and not a problem due to my changes.

Was this problem already reported  ?

Many thanks

0 Kudos
Reply
3,644 Views
fabio_estevam
NXP Employee
NXP Employee

Hi Damien,

Good progress.

Let's try to fix the duart issue first: I have just tested top of tree U-boot on my mx28evk and duart works fine here (U-Boot 2015.01-rc3-00069-gfc9b0b8).

Make sure your terminal has flow control disabled.

0 Kudos
Reply
3,644 Views
dgotfroi
Contributor IV

Thanks for your answer.

It's a bug on the U-Boot 2015.01-rc2.

With U-Boot 2015.01-rc3 it works :smileyhappy: !

There were no modification on SPL_POWER_INIT.c and SPL_MEM_INIT.c between rc2 and rc3 so all my modifications are still good.

This I my debug output :

HTLLC

Configured for 5v only power source.

Valid 5V detected

sz =08000000

LLC

U-Boot 2015.01-rc3 (Dec 12 2014 - 15:26:45)

CPU:   Freescale i.MX28 rev1.2 at 454 MHz

BOOT:  SSP SD/MMC #0, 3V3

SPI:   ready

DRAM:  128 MiB

NAND:  0 MiB

MMC:   MXS MMC: 0

MMC0: Command 8 timeout (status 0xe0284020)

MMC0: Command 55 timeout (status 0xe0384020)

MMC0: Command 1 timeout (status 0xe02c4020)

Card did not respond to voltage select!

MMC init failed

Using default environment

Video: MXSFB: 'videomode' variable not set!

In:    serial

Out:   serial

Err:   serial

Net:   FEC0 [PRIME], FEC1

Warning: FEC1 using MAC address from net device

Hit any key to stop autoboot:  0

=>

Now, the boot fails during mxs_mem_get_size() function. Especially on this line : sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);

If I force sz to  be 512Mib (so replace the previous line by sz=0x20000000), U-boot stops here :

HTLLC

Configured for 5v only power source.

Valid 5V detected

sz = 20000000

LLC

U-Boot 2015.01-rc3 (Dec 12 2014 - 15:36:08)

CPU:   Freescale i.MX28 rev1.2 at 454 MHz

BOOT:  SSP SD/MMC #0, 3V3

SPI:   ready

DRAM:

But if I force sz to be 128Mib (so sz=0x08000000), It works but with only 128Mib (see debug output above)

EDIT :

The following lines are normal because I launch U-boot with mxsldr, so I don't have any sd card on my board :

MMC0: Command 8 timeout (status 0xe0284020)

MMC0: Command 55 timeout (status 0xe0384020)

MMC0: Command 1 timeout (status 0xe02c4020)

Card did not respond to voltage select!

MMC init failed

0 Kudos
Reply
3,644 Views
fabio_estevam
NXP Employee
NXP Employee

Hi Damien,

The sz = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE); assumes that there is only one bank of RAM.

I suppose you use EMI_CE0 and EMI_CE1 for the DDR chip selects on your board, right? Then you should use CONFIG_NR_DRAM_BANKS 2.

You should also change the size calculation as follows:

sz1 = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);

sz2 = get_ram_size((long *)PHYS_SDRAM_2, PHYS_SDRAM_2_SIZE);

sz = sz1 + sz2;

and then in your board config file you need to pass PHYS_SDRAM_2 and PHYS_SDRAM_2_SIZE definitions.

Also, you would need to adjust CS_MAP field to 3 in the HW_DRAM_CTL29 register to make use of the 2 Chip Selects.

In board/freescale/mx28evk/iomux.c we have:

#define CS_MAP 0xf  as we use a single chip select.

you should change it to 3 for your board.

0 Kudos
Reply
3,644 Views
fabio_estevam
NXP Employee
NXP Employee

Damien,

Maybe the two changes below should be enough:

1. Change CS_MAP to 3

2. In the board config file use:

/* Memory configuration */

#define CONFIG_NR_DRAM_BANKS        1        /* 1 bank of DRAM */

#define PHYS_SDRAM_1            0x40000000    /* Base address */

#define PHYS_SDRAM_1_SIZE        0x40000000    /* Max 1 GB RAM */

#define CONFIG_SYS_SDRAM_BASE        PHYS_SDRAM_1

I think this would allow U-boot to detect the correct memory size.

If that does not work, then we should consider changing sz calculation as mentioned in my previous post.

0 Kudos
Reply
3,644 Views
dgotfroi
Contributor IV

Thanks for your help.

I use a Samsung K4T51163QQ-BCE7.

This is the addressing configuration :

Configuration : 32Mb x16

# of Bank : 4

Bank Address : BA0,BA1

Auto precharge : A10/AP

Row Address : A0 ~ A12

Column Address : A0 ~ A9

I only use 1 chip select, EMI_CE0 (my DDR has only one pin CS). But the Bank is selected with EMI_BA0 and EMI_BA1.

So, I suppose I don't need to change anything to CS_MAP, isn't it ?

Many thanks

0 Kudos
Reply
3,644 Views
fabio_estevam
NXP Employee
NXP Employee

Hi Damien,

The DDR you use is 512Mbits, which correspond to 64MBytes and you should use

CONFIG_NR_DRAM_BANKS    1

as only one chip select is used.

Yes, you don't need to change CS_MAP.

Regards,

Fabio Estevam

0 Kudos
Reply
3,641 Views
dgotfroi
Contributor IV

Is the problem can only come from the DDR initialisation in the spl_mem_init ?

Because I retry a lot of time, I followed the excel tools scrupulously to set all the HW_DRAM_CTL register but I still have this error.

Many thanks

0 Kudos
Reply
3,641 Views
fabio_estevam
NXP Employee
NXP Employee

Are you able to boot the kernel on your board if you use bootlets instead? Does it boot without issues in this case?

I am not sure if the problem is bad DDR init or U-boot porting? Are the power supplies stable?

0 Kudos
Reply
3,641 Views
dgotfroi
Contributor IV

Maybe I found something.

The DDR2 our supplier provided us were not the DDR2-800 but DDR2-667 version ! So this DDR can not run at 200MHz. Do you know how to speed down the DDR clock to 166 MHz ?

Thanks

0 Kudos
Reply
3,641 Views
fabio_estevam
NXP Employee
NXP Employee

If I recall correctly there is an entry in the Excel datasheet for the DDR frequency, so you should adjust it there.

0 Kudos
Reply
3,641 Views
dgotfroi
Contributor IV

Ok, I have set 166 MHz in the excel tool and in spl_mem_init i set divider (for HW_CLKCTRL_FRA0_EMI) to 26 (for 166 MHz).

But it still don't work.

I look at the scoope and the power supply is really solid. 1V8 is 1.81V and 4V2 is 4.24V.

On the imx28evk, everything works fine

0 Kudos
Reply
3,641 Views
MarioEBV
Contributor II

Hi Damien,

I made some changes to the patches you made for the memory and now I'm able to start Linux on your custom board :-)

Image is build using Yocto Dizzy.  Only quick test I did now are a couple of reboots to check if the board starts up into Linux.

I will included a memory tester program in the image so we are able to do a complete test of the memory range and test stability of this memory configuration.

I will mail you the different patches and memory configurator file.

0 Kudos
Reply
3,641 Views
fabio_estevam
NXP Employee
NXP Employee

Hi Mario,

This is great news! By "I will included a memory tester program in the image" do you mean to use the memtester program?

Regards,

Fabio Estevam

0 Kudos
Reply