u-boot stuck after porting LPDDR2 base on IMX7ULP

[sam_liu]

Hello Everyone,

  In my project is base on I.MX7ULP and porting SDRAM LPDDR2 on my project EVB and BSP :imx-4.9.51-8mq_ga.

  (Original  BSP SDRAM setting in is for LPDDR3)

Now I already porting the setting of DCD table in imximage.cfg file.But when I power on my EVB the u-boot will stuck at "DRAM:" line and then no log anymore  .

log show as below: 

---------------------------------------------------------------------------------------------------------------------------------

U-Boot 2017.03-imx_v2017.03_4.9.51_imx8m_ga+g2537522 (Jul 04 2018 - 14:27:51 +0800)

CPU: Freescale i.MX7ULP rev2.0 at 500 MHz
Reset cause: POR
Boot mode: Dual boot
Model: NXP i.MX7ULP EVK
DRAM:

----------------------------------------------------------------------------------------------------------------------------------

And then I trace the u-boot source code ,u-boot will stuck at the command : "size += gd->bd->bi_dram[i].size;"

 in "static int show_dram_config(void)"  function   of the "board_f.c" file .

u-boot source code  show as below:

==========================================================================

static int show_dram_config(void)
{
unsigned long long size;

#ifdef CONFIG_NR_DRAM_BANKS
int i;

debug("\nRAM Configuration:\n");
for (i = size = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
size += gd->bd->bi_dram[i].size;
debug("Bank #%d: %llx ", i,
(unsigned long long)(gd->bd->bi_dram[i].start));
#ifdef DEBUG
print_size(gd->bd->bi_dram[i].size, "\n");
#endif
}
debug("\nDRAM: ");
#else
size = gd->ram_size;
#endif

print_size(size, "");
board_add_ram_info(0);
putc('\n');

return 0;
}

==========================================================================

It's seem like that execute "gd->bd->bi_dram[i].size;" operation will cause the error. 

Does anyone can help me whether I porting the imximage.cfg (for change SDRAM to LPDDR2  on my EVB )incorrect ?

Or other reason cause this error ?

Thanks~

[sam_liu]

Hi Rakesh Patel,

This case has passed for quite a while, but I remember that in the file: /u-boot-imx/.../mx7ulp_evk.c, there is a gpio default setting that conflicts with our EVB pin. You can try to find Whether there is a conflict.

[rakesh_patel]

SamLiu98115‌:

How you solve this ? I am also facing same.

[igorpadykov]

Hi Sam

one can check #define PHYS_SDRAM_SIZE  in uboot/include/configs/mx7ulp_evk.h

mx7ulp_evk.h\configs\include - uboot-imx - i.MX U-Boot 

Note, only Linux 4.9.88_2.0.0 BSP should be used for i.MX7ULP, as only this release

currently supports this processor, as stated in Release Notes included in documentation:

https://www.nxp.com/webapp/Download?colCode=L4.9.88_2.0.0_LINUX_DOCS&Parent_nodeId=13376994810717061... 

Best regards
igor
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[sam_liu]

Hi igorpadykov,

  Thanks for your help ,according to your advise  the u-boot on my customer board can correctly working.

(the SDRAM size in my customer board is 1Gibits=128MiB)

Actually I'm not only  modify "#define PHYS_SDRAM_SIZE  SZ_128M " but also modify the parameter as below:

//== [mx7ulp_evk.h] =================================

from:

"#define CONFIG_SYS_MALLOC_LEN (8*SZ_1M)" 

to:

"#define CONFIG_SYS_MALLOC_LEN (4*SZ_1M)"

//===============================================

But now my customer board just can boot up till "Starting kernel ..." message ,and then it's halt .

I also trace the u-boot source code ,it's seem to stuck at "kernel_entry(0, machid, r2);" in bootm.c file.

Whether change the parameter "#define CONFIG_SYS_MALLOC_LEN (4*SZ_1M)" affect the Linux kernel?

Or there are other reasons cause this bug?

Could you give me some hits of this issue.

Thanks.

[igorpadykov]

Hi Sam

had you run ddr test for that part as for example for i.MX6Q (i.MX6/7 DDR Stress Test Tool V2.90 )

i.MX7ULP Register Programming Aids 

As i.MX7ULP is still in preproduction stage this tool is not publicly available yet, you will have to wait its

public release

i.MX 7ULP Applications Processor | Single Arm® Cortex®-A7 + Cortex-M4 with ultra low power |NXP 

Best regards
igor