topic Re: U-boot problem for customized board in i.MX Processors

U-boot problem for customized board

srinivasaporam — Thu, 12 Nov 2015 21:18:21 GMT

Hi,

We have got a custom board whose design is based on IMX6Q/IMX6DL reference design but differing in memory technology (shifted from DDR3 to LPDDR2) So we have edited u-boot accordingly, but we are unable to boot in the new board.

1. We have used only 512 MB of LPDDR2 where as reference board is 1GB or 2GB (Dual lite or Quad). for this we have made

int dram_init(void)

{

gd->ram_size = (phys_size_t)(CONFIG_DDR_MB/2) * 1024 * 1024; //CONFIG_DDR_MB is define as 1024

return 0;

}

2. Reference board is either Quad or Duallite. But our processor is IMX6 Dual processor. In software what files need to be modified.

3.Since our memory is LPDDR2 (512 MB, 2x32) we have edited following files : ddr_setup.cfg and 800mhz_4x128mx16.cfg and edited all the values that we have got from lpddr2 script aid and memory stress test (Please find the attached)

and after compiling the u-boot (bash build_u-boot.sh) and copying the u-boot.imx is not displaying any messages and if we are doing the same for refrence board, then we are getting following messages:

U-Boot 2014.01 (Nov 13 2015 - 00:45:12)

CPU: Freescale i.MX6DL rev1.1 at 792 MHz

Reset cause: POR

Board: Wandboard

I2C: ready

DRAM: 1 GiB

MMC: FSL_SDHC: 0, FSL_SDHC: 1

*** Warning - bad CRC, using default environment

No panel detected: default to HDMI

Display: HDMI (1024x768)

In: serial

Out: serial

Err: serial

Net: FEC [PRIME]

Hit any key to stop autoboot: 0

mmc0 is current device

So why boot messages are not coming for our customized board. are we missing/unedited/not modified some files????

Original Attachment has been moved to: ddr-setup.cfg.zip

Original Attachment has been moved to: 800mhz_4x128mx16.cfg.zip

Re: U-boot problem for customized board

sinanakman — Thu, 12 Nov 2015 21:46:22 GMT

Hi Srinivasa

Did you use the right DCD initialization

for your DDRs ?

Also if you are using mainline u-boot please

use the more recent version.

Hope this helps

Sinan Akman

Re: U-boot problem for customized board

srinivasaporam — Thu, 12 Nov 2015 21:58:26 GMT

Hi,

Where to check the correctness of DCD for DDRs. We have got this u-boot from BSP 3.10.53.

For DDR3 to LPDDR2 We are not having following values in LPDDR2 script aid:

DATA 4, MX6_MMDC_P0_MDASP,

DATA 4, MX6_MMDC_P0_MPDGCTRL0,

DATA 4, MX6_MMDC_P0_MPDGCTRL1,

DATA 4, MX6_MMDC_P1_MPDGCTRL0,

DATA 4, MX6_MMDC_P1_MPDGCTRL1,

DATA 4, MX6_MMDC_P0_MPWLDECTRL0,

DATA 4, MX6_MMDC_P0_MPWLDECTRL1,

DATA 4, MX6_MMDC_P1_MPWLDECTRL0,

DATA 4, MX6_MMDC_P1_MPWLDECTRL1,

Re: U-boot problem for customized board

igorpadykov — Fri, 13 Nov 2015 07:48:30 GMT

Hi Srinivasa

at this point it is useful to attach jtag and check where processor jumped,

registers SRC_SBMR1,2 for boot settings. Check memory with jtag by read/write

patterns to different memory locations. Also one can try to run uboot with jtag

imx6, arm, and linux - tips and tricks: Inexpensive JTAG on the imx6 solo: U-Boot Launch and Debug

Best regards

igor