i.MX28 u-boot fail

JHY — Fri, 07 Nov 2014 06:46:27 GMT

Hi, I use i.MX28 in a custom board and want to use only VDD5V power source.

After applying L2.6.35_10.12_5V_SUPPLY_PATCH, SPL runs without problems but u-boot loading is fail printing out consol messages 'Undefined Ins'.

3.3V, 1.8V, 1.5V outputs are good and memory access tests have no error in SPL, only u-boot loading has problems.

Futhermore when I use DCDC4P2 power source in same board, it works all right, SPL, u-boot, lnux and every apps.

Are there missing pieces?

The registers are below,

All of DCDC_ENABLE=DCDC_XFER=LINREG_OFFSET=DISABLE_FET=0 and ENABLE_LINREG=1

5vctrl (2403F592),

dcdc4p2 (A000001F),

vddd (00F00710),

vdda (000F070C),

vddio (00070406),

vddmem (00000230)

Re: i.MX28 u-boot fail

igorpadykov — Fri, 07 Nov 2014 07:31:56 GMT

Hi JHY

uboot and patch PMU settings are given for i.MX28 EVK and

may differ for custom board, in general you can add debug printfs to code

(or run it with jtag ) to find out where error condition (or brownout) occured.

It is not possible to give beforehand these settings for custom board since

they may differ one board from another.

Best regards

igor