Hello,
I am building my custom imx28 based board with nand flash without battery. My board has not sd card input so i am planning to write a kernel and filesystem to nand with uboot.
I edited imx-bootlets-src-10.12.01 for no battery (uncomment //#define NO_DCDC_BATT_SOURCE in /power_prep/power_prep.c)
I found some other u-boot named like uboot-imx, u-boot, u-boot-fslc (i tried all) and built with imx28evk_nand_defconfig config.
log is here after load sb file.
>> TS-BOOTROM - built Jul 16 2016 15:07:59
>> Copyright (c) 2013, Technologic Systems
U-Boot 2015.10-00059-g8ee67c1 (Jul 16 2016 - 15:05:09 +0300)
CPU: Freescale i.MX28 rev1.2 at 454 MHz
BOOT: ğŸåğŸåğŸåğŸåğŸåğŸå
SPI: ready
DRAM:
It stucks before displaying dram size as if it were in a while loop and boot mode displays unknown characters.
How can i fix this error?
已解决! 转到解答。
Hi Ahmet
this may be caused by ddr errors or brownout exceptions, so one can try
adjust it with ddr tools:
Board Bring-up and DDR Initialization Tools | NXP Community
https://community.freescale.com/message/375692#375692
and add debug printfs in bootlets power_prep.c to find which instruction
caused brownout (can be adjusted with HW_POWER_VDDDCTRL[BO_OFFSET])
Just for test may be recommended to run latest nxp bsp:
Board Support Packages (5)
i.MX28 Linux 2.6.35 Source Code Files and documentation (REV L2.6.35_1.1.0)
Best regards
igor
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I run mem_test in https://community.nxp.com/message/375692#comment-375692 with no battery patch. I will attach sb file, perhaps may be necessary for someone.
mem_test logs;
--------------------------------
PowerPrep start initialize power...
Configured for 5v only power source. Battery powered operation disablpause
start
simple test
Actual CPU frequency (MHz): 480
Actual EMI frequency (MHz): 196
DDR test passed
t0: memcpy11 SSN test
CSD0
Program the source memory
--------------------------------
Cpu is restarting before "DDR test passed" and stucks, I heard usb plug out sound.
My settings:
#define CSD0_BASE_ADDR 0x40000000
U32 dram_density = 0x8000000, num_cs = 1;
Where may the error be?
Hi Ahmet
this may be caused by ddr errors or brownout exceptions, so one can try
adjust it with ddr tools:
Board Bring-up and DDR Initialization Tools | NXP Community
https://community.freescale.com/message/375692#375692
and add debug printfs in bootlets power_prep.c to find which instruction
caused brownout (can be adjusted with HW_POWER_VDDDCTRL[BO_OFFSET])
Just for test may be recommended to run latest nxp bsp:
Board Support Packages (5)
i.MX28 Linux 2.6.35 Source Code Files and documentation (REV L2.6.35_1.1.0)
Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------
I could not do with ltib so i built bootlets and uboot from source.
My current logs,
---------------------------------------------------------------------------
PowerPrep start initialize power...
Configured for 5v only power source. Battery powered operation disabled.
DRAM prep starting
MEM_MDDR = FALSE
Jul 18 201613:50:11
FRAC 0x92925552
memory type is DDR2
Wait for ddr ready 1power 0x00820616
Frac 0x92925552
start change cpu freq
hbus 0x00000003
cpu 0x00010001
start test memory accress
ddr2 0x40000000
finish simple test
U-Boot 2011.09-01112-g8c6b5d0 (Jul 18 2016 - 13:48:50)
Freescale i.MX28 family
I2C: ready
DRAM: 0 Bytes
---------------------------------------------------------------------------
It stucks after then. Currently memory test between 0 - 1000, when i change memory test to between 32 * 1024 * 1024 - 48 * 1024 * 1024, dram says 32mb and uboot starts succesfully. Where may the error be?
I am going to try with "i.MX28 Linux 2.6.35 Source Code Files and documentation (REV L2.6.35_1.1.0)" files but I couldnt find bootlets in this folder, how can i download bootlets source code in nxp?
When I try to run ltib (with perl5), it says;
Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/(%{ <-- HERE ?([^}]+)}?)/ at /home/ard/Desktop/L2.6.35_1.1.0_130130_source/ltib/ltib/bin/Ltibutils.pm line 237.
Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at /home/ard/Desktop/L2.6.35_1.1.0_130130_source/ltib/ltib/bin/Ltibutils.pm line 362.
Compilation failed in require at ./ltib line 39.
BEGIN failed--compilation aborted at ./ltib line 39.
How can I fix this errors?