Sometime Failed to read from NAND on i.mx6ul

[dhvanil_patel1]

Hi All,

I am working on i.mx6ul based board. Sometimes I am facing an error to detect and read data from NAND. If I power cycle the board again then  No NAND detect or read error reproduced.

I am waiting for responses.

Log:

U-Boot 2015.04-imx_v2015.04_3.14.52_1.1.0_ga+g6cf684a (Aug 10 2016 - 11:30:25)

CPU: Freescale i.MX6UL rev1.0 at 396 MHz
CPU: Temperature 31 C
Reset cause: POR
Board: MX6UL Volansys BR
I2C: ready
DRAM: 256 MiB
PMIC: PFUZE3001 DEV_ID=0x31 REV_ID=0x11
NAND: 1024 MiB     : NAND is detected 
MMC: Inside FSU_config 0
FSL_SDHC: 0
*** Warning - bad CRC, using default environment

In: serial
Out: serial
Err: serial
Net: FEC0
Normal Boot
Hit any key to stop autoboot: 0

NAND read: device 0 offset 0x4000000, size 0x800000   // Reading kernel from NAND
MXS NAND: DMA read error       // DMA read error
NAND read from offset 4000000 failed -110     
0 bytes read: ERROR

NAND read: device 0 offset 0x5000000, size 0x100000  // try to read from device tree from NAND
MXS NAND: Error sending command        // failed to send command error
MXS NAND: Error sending command      

Hi,

Igor1z‌ Please help us to resolve this 

-

Dhvanil Patel

[igorpadykov]

Hi Dhvanil 

issue may be caused by signal integrity issues,

so please catch waveforms by oscilloscope, checking signal timings

with datasheet, then tweak drive strength of processor

nand signals. Use Table 5-7. NAND Boot Fusemap "Override NAND Pad

Settings" i.MX6UL Reference Manual
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6ULRM.pdf

Best regards
igor
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