i.MX ProcessorsのトピックRe: internal boot from uSHC2

internal boot from uSHC2

lk22 — Wed, 11 Feb 2015 13:22:07 GMT

Hi,

We are using i.MX6 Solo processor. For that we are using boot mode 10 (internal boot mode) and done GPIO setting for boot from uSHC--2 (microSD card). But it is not booting from it. I have checked the clock and command lines, but I have not seen any activity there.

In boot mode 00, because of manufacturing mode it is booting from uSHC--2 (microSD card).

I have checked all the GPIO settings. For reference I have attaché d the GPIO settings.

With regards

Re: internal boot from uSHC2

igorpadykov — Wed, 11 Feb 2015 13:46:45 GMT

Hi Lalit

does second POR (without power-off board) help ?

Best regards

igor

Re: internal boot from uSHC2

lk22 — Wed, 11 Feb 2015 14:18:36 GMT

No. I have tried many resets (without power off) after that.

Re: internal boot from uSHC2

igorpadykov — Wed, 11 Feb 2015 15:17:10 GMT

one can connect jtag debugger and check

SRC_SBMR1,2 registers, they should have

correct boot settings, which set by boot pins.

Re: internal boot from uSHC2

lk22 — Wed, 11 Feb 2015 15:58:37 GMT

Yes, SRC_SBMR1,2 registers have correct boot settings.

Re: internal boot from uSHC2

igorpadykov — Wed, 11 Feb 2015 16:09:14 GMT

had you checked SD2 signals by ocilloscope

during power-up, have you valid signal on CD,

as shows Table 8-18 IMX6SDLRM ?

Re: internal boot from uSHC2

lk22 — Wed, 11 Feb 2015 17:29:38 GMT

Yes. I have checked all gpio settings. Also checked cmd and clock lines with boot mode 00 and 10. In boot mode 10 there is no signal,while in boot mode 00 i was able to get the clock in oscilloscope.

CD is low then only it is booting from sd-2 in boot mode 00.

Re: internal boot from uSHC2

igorpadykov — Thu, 12 Feb 2015 01:11:15 GMT

why CD level different in two cases ?

It is output from SD card and should be correct (card present)

in both cases.

Re: internal boot from uSHC2

lk22 — Thu, 12 Feb 2015 01:21:51 GMT

It is same in both cases, not different.

Re: internal boot from uSHC2

igorpadykov — Thu, 12 Feb 2015 01:44:51 GMT

what reference design is based your board - is it Freescale

reference board ? Also is pmic used, if yes what its full marking ?

Re: internal boot from uSHC2

lk22 — Thu, 12 Feb 2015 04:48:15 GMT

Yes, I had referred Freescale SABRE-AI_DualLite_CPUcard

PMIC marking is

MMPF0100

F2EP

DKHYDC

With regards

Re: internal boot from uSHC2

igorpadykov — Thu, 12 Feb 2015 09:28:37 GMT

please check by oscilloscope voltages (_ARM_CAP,SOC_CAP,HIGH_CAP)

and clocks 24MHz,32.768KHz in both good and bad cases.

Check that ripple noise should be less than 5% Vp-p of supply voltage average value.

Also check if _CAP capacitors comply with latest recommendations below

HW Design Checking List for i.MX6DQSDL

~igor

Re: internal boot from uSHC2

lk22 — Thu, 12 Feb 2015 15:08:04 GMT

VDDARM_CAP: 1.17V (pk-pk ripple 0.84%)

VDDSOC_CAP: 1.17V (pk-pk ripple 3.4%)

VDDHIGH_CAP: 2.52V (pk-pk ripple 1.78%)

24MHz and 32.768KHzboth are in good shape

We have taken care whatever mention in the checklist.

It is booting from SD-2 slot in boot mode 00. So I am just thinking, if there is any such issue, it should create problem there also. We are not able to get the clock or command signals itself. It means it is not even going to that step.

With regards

Re: internal boot from uSHC2

igorpadykov — Thu, 12 Feb 2015 15:41:38 GMT

could you try to set BOOT_CFG2[5]=0 1-bit mode and check,

if it boots or any signal appears on SD bus ?

~igor

Re: internal boot from uSHC2

lk22 — Thu, 12 Feb 2015 18:13:29 GMT

I had already tried this. Bit there was no clock signal.

Re: internal boot from uSHC2

igorpadykov — Fri, 13 Feb 2015 04:48:22 GMT

- if this issue happens on one board or all (how many)

- could you provide full i.MX6 marking

- in bad case, does processor go to "Serial Downloader"

or just hangs ? If hangs, could you attach jtag and check where (address) ?

~igor

Re: internal boot from uSHC2

lk22 — Fri, 13 Feb 2015 06:26:42 GMT

This issue happens on all boards

Full .MX6S marking:

MCIMX6S7CVM08AC

XAA1423

2N81E

TAIW AWAAXD

We don’t have OTG port. I think it hangs. I have to check on it.

With regards

Re: internal boot from uSHC2

igorpadykov — Fri, 13 Feb 2015 09:10:46 GMT

also I would suggest to try check log buffer (usage described on link below),

with jtag check ROM address 0x000000d8, it contains pointer (0x00901AB8) to internal RAM

location where boot log buffer is stored. Can you send first 256 bytes of that buffer

for check.

i.MX6Q NAND boot issues

~igor

Re: internal boot from uSHC2

igorpadykov — Fri, 13 Feb 2015 14:32:33 GMT

also please recheck that BOOT_CFG4[7]

(UART3_RTS ) not set to "1".

Table 8-2. Boot eFUSE Descriptions IMX6SDLRM

BOOT_CFG4[7]=1 Infinite Loop Enable at start

of boot ROM. Used for debugging purposes.

Re: internal boot from uSHC2

lk22 — Fri, 13 Feb 2015 14:48:55 GMT

BOOT_CFG4[7] is 1 as per original design. Only in one board we have changed it to 0, as per suggestion from Artur (tech support, Freescale).

With regards