topic Re: imx233 bootlet BCB in i.MX Processors

imx233 bootlet BCB

samarjit_samant — Fri, 06 Oct 2017 05:13:39 GMT

I am trying to boot my custom imx233 board https://github.com/samarjit/MyIMX233.

I have not burnt HW_OCOTP_ROM0::SD_MBR_BOOT yet so I am using BCB. I have been trying to run with 8GB SD card. I downloaded bootstream_make_bootable.pl, write_bootstream.pl from https://groups.google.com/forum/#!topic/rockboxplayer/CtLFCED9wWM.

I got u-boot.sb from http://os.archlinuxarm.org/os/armv5te/boot/olinuxino/u-boot.sb

Ran the below command to load onto SD card

perl ./write_bootstream.pl u-boot.sb /dev/mmbclk0
perl ./bootstream_make_bootable.pl /dev/mmbclk0 u-boot.sb

For 8GB card I needed to modify bootstream_make_bootable.pl slightly to locate boot signature correctly.

This creates a BCB which point to MBR of u-boot.sb.

After this I get HTLC<0>HTLC<0>... repeatedly. I guess it is rebooting. I am stuck at how to debug any further.

Is there a way I can use bootlets instead of u-boot.sb using BCB?

Or, is it better to burn the otp HW_OCOTP_ROM0::SD_MBR_BOOT to install bootlets?

Board is powered by USB and UART is used to get the logs.

Re: imx233 bootlet BCB

igorpadykov — Fri, 06 Oct 2017 23:11:38 GMT

Hi samarjit

please check

https://community.nxp.com/message/394276?commentID=394276#comment-394276

Best regards
igor
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Re: imx233 bootlet BCB

samarjit_samant — Sat, 07 Oct 2017 13:58:34 GMT

Hi igor, I finally gave up the idea of debugging further with BCB and decided to take risk and burn the OTP.

Now I flashed the SD card with image from https://www.olimex.com/wiki/IMX233 which provides the link to https://www.olimex.com/wiki/images/6/6d/Imx233_kernel_2.6_ARCH_FS_WIFI_release_5.torrent. I didn't create any partition for u-boot. dd if=imx233_kernel_2.6_ARCH_FS_WIFI_release_5.img of=/dev/mmcblk0

If I try to measure the voltages using multimeter they are fluctuating a lot.

I can measure these voltages 3.3v, 1.2v,1v, 4p2 they are also going up and down in a cycle. I cannot see if this cycle is matching with rebooting time.

But 2.5v I cannot even see on multimeter, it is just fluctuating around 0-300mv.

HTLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLFC
PowerPrep start initialize power...
Battery Voltage = 2.91V
Chargeable battery detected but the voltage is too low for battery powered operation.Booting from 5V power source.
LLCJun 14 201614:59:00
EMI_CTRL 0x1C084040
FRAC 0x92926192
init_ddr_mt46v32m16_133Mhz
power 0x00820710
Frac 0x92926192
start change cpu freq
hbus 0x00000003
cpu 0x00010001
LLLLLLLFCLJ
Data Abort
r14_<0>HTLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLFC
PowerPrep start initialize power...
Battery Voltage = 2.91V
Chargeable battery detected but the voltage is too low for battery powered operation.Booting from 5V power source.
LLCJun 14 201614:59:00
EMI_CTRL 0x1C084040
FRAC 0x92926192
init_ddr_mt46v32m16_133Mhz
power 0x00820710
Frac 0x92926192
start change cpu freq
hbus 0x00000003
cpu 0x00010001
LLLLLLLFCLJ
Data Abort
r14_<0>HTLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLFC
PowerPrep start initialize power...
Battery Voltage = 2.90V
Chargeable battery detected but the voltage is too low for battery powered operation.Booting from 5V power source.
LLCJun 14 201614:59:00
EMI_CTRL 0x1C084040
FRAC 0x92926192
init_ddr_mt46v32m16_133Mhz
power 0x00820710
Frac 0x92926192
start change cpu freq
hbus 0x00000003
cpu 0x00010001
LLLLLLLFCLJ
HTLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLFC
PowerPrep start initialize power...
Battery Voltage = 2.90V...

What could be wrong now?

Re: imx233 bootlet BCB

samarjit_samant — Sun, 08 Oct 2017 08:49:35 GMT

Finally linux got loaded and booted.

In 128LQFP

DCDC_BATT - pin 100

BATT - pin 103

I was working with 5v only circuit as per i.mx23_reference_sch_revc.pdf where BATT & DCDC_BATT were connected via 1K resistors to VDD_4p2 rail.

DCDC_BATT had 1uf cap. But BATT pin had 47uf cap ceramic. When I added 100uf elecrolytic caps in BATT I got this below error plus sometimes SD card general failure 0x8020A023, 0x8020A00E .

LLLLLLLFCLJ
Data Abort
r14_HTLC.....

But finally I shorted both DCDC_BATT and BATT and grounded by capacitors 1uf and 47uf ceramic which stabilized power supply I guess. I am not fully sure why it worked.