help with linux-fslc 3.18.7 stops at "Uncompressing Linux... done, booting the kernel"

help with linux-fslc 3.18.7 stops at "Uncompressing Linux... done, booting the kernel"

[justin chaise]

Hello all, I hope this is the correct mail list.
If some one could take some time and read all of this I would be very grateful.

linux-fslc 3.18.7
u-boot-fslc

PROBLEM:
I can not get past "Uncompressing Linux... done, booting the kernel".

MY GOAL:
My goal is to load a tiny operating system to DRAM, so that I can burn
the NAND through the USB port.
(something like Manufacturing tools).
Prototypes only have recovery mode accessible, and can only be loaded
by recovery mode. Boot mode is hard-wired in NAND configuration.

DEBUG PORT OUTPUT:   NOTICE ALL TEST ARE USING 8 MEG DRAM MODEL
------------------------------------------------
U-Boot 2015.04 (Jul 17 2015 - 15:33:27)

CPU:   Freescale i.MX23 rev1.3 at 454 MHz
BOOT:  NAND
DRAM:  8 MiB
MMC:   MXS MMC: 0
MMC0: No card detected!
MMC init failed
Using default environment

Video: MXSFB: 'videomode' variable not set!
In:    serial
Out:   serial
Err:   serial
Hit any key to stop autoboot:  0
Kernel image @ 0x40400000 [ 0x000000 - 0x07eb10 ]
## Flattened Device Tree blob at 40700000
   Booting using the fdt blob at 0x40700000
   Loading Device Tree to 40365000, end 4036aa04 ... OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
------------------------------------------------
After waiting for several minutes I have no additional output. In
addition I have noticed the HID sb_loader has not disconnected.

Questions:
* Is the small 8 MEGS of DRAM causing the MMU to not operate correctly?
* Is the MMU altering my DRAM MMU clock? ( I had to set to EMI 96 Mhz
for DRAM stability in U-boot.)
* Why would the MMU appear to crash?
* Is the .config file wrong?
* Is there a Setting incorrect in my DTS file? ( I do not think the
DTB is used before /init/main.c )

Please help me find a solution to my issues here. I should to tell you
that I have been working on this for a
few months now without resolve. I have tried to figure things out
myself, but I guess I really need help. I am new to embedded products
and the linux operating system.

Ideas, Comments or Documentation are very welcome.
I have read and reread so much information, if could be specific as to
the chapter or section that would help me.
Please any help is greatly appreciated.

Thanking you very considerately in advance.
jc__

I have included links to my files so that you may look at them.
---------------------------------------
* this file - help question
** mxs_help.txt
*** https://www.dropbox.com/s/tu1nf78ldn72lon/mxs_help.txt?dl=0

* my debug attempts:
** mxs_debugAttempts.txt
*** https://www.dropbox.com/s/668l9umlx1dop0i/mxs_debugAttempts.txt?dl=0

* my hardware and soft ware specs
** mxs_HardwareAndSoftwareSpecs.txt
*** https://www.dropbox.com/s/x0nx2labg9j1anb/mxs_HardwareAndSoftwareSpecs.txt?dl=0

* my step by step build procedure
** mxs_StepByStepBuild.txt
*** https://www.dropbox.com/s/zidpwkqfgvv713g/mxs_StepByStepBuild.txt?dl=0
---------------------------------------
* u-boot source files that I changed
** spl_mem_init.c
*** https://www.dropbox.com/s/jzir5exvsaii96d/spl_mem_init.c?dl=0
** mx23evk.h
*** https://www.dropbox.com/s/6y6zwy1bts31zdr/mx23evk.h?dl=0

* linux-fslc files
** System.map
*** https://www.dropbox.com/s/nyd561xt8rn2s42/System.map?dl=0
** ampd2-Changes.dts
*** https://www.dropbox.com/s/ctj8gn6fh6od19k/ampd2-Changes.dts?dl=0
** .config
*** https://www.dropbox.com/s/vko6q5vdajqgz5w/.config?dl=0

* Elftosb 2.6.1
** mycmd
*** https://www.dropbox.com/s/hw81j8i2xwolzme/mycmd?dl=0
** ampd2-Changes.dtb
*** https://www.dropbox.com/s/deyqc3fezg4s6v7/ampd2-Changes.dtb?dl=0
** u-boot.bin
*** https://www.dropbox.com/s/0p097iemlqi8wke/u-boot-spl.bin?dl=0
** u-boot-spl.bin
** zImage
*** https://www.dropbox.com/s/4qo5tk1cuv06yli/zImage?dl=0
---------------------------------------

Re: help with linux-fslc 3.18.7 stops at "Uncompressing Linux... done, booting the kernel"

[Otavio Salvador]

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On Wed, Aug 5, 2015 at 11:24 AM, justin chaise <justinchaisejmc1@gmail.com>
wrote:

> Hello all, I hope this is the correct mail list.
> If some one could take some time and read all of this I would be very
> grateful.
>

I won't be able to review your source code but I strongly advise you to
move for Fido as it offers a much newer kernel and a more polished user
space software stack.

-- 
Otavio Salvador                             O.S. Systems
http://www.ossystems.com.br        http://code.ossystems.com.br
Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750

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Re: help with linux-fslc 3.18.7 stops at "Uncompressing Linux... done, booting the kernel"

[Nikolay Dimitrov]

Hi Justin,

Please check this Yocto discussion from May 2015:

https://lists.yoctoproject.org/pipermail/meta-freescale/2015-May/013953.html

Regards,
Nikolay

Re: help with linux-fslc 3.18.7 stops at "Uncompressing Linux... done, booting the kernel"

[justin chaise]

Thanks Nikolay,
It looks like that discussion was about a 'missing' dtb file, device
tree therefor no terminal to display kernel bootup info.

I use the command in u-boot to pass the blob location in sdram.
bootz 0x40400000 - 0x40700000
my boot arguments are
bootargs=earlyprintk console=ttyAMA0,115200n8  mem=nopentium

I dont think that the kernel ever gets to that point because it seem
to lockup when the mmu is enabled.
head.S - command
mcr    p15, 0, r0, c1, c0, 0        @ write control reg

To see what would happen I did comment out that line and the kernel
continued on for a little while, finding the device tree blob.
All of my debugging says that this line locks up the cpu.
I don't believe that the kernel ever gets to the point of using the blob.
Am I completely wrong here?

I have not updated my code from linux-fslc since June (30 days old
code) this year because it looks like a lot of changes are going on to
up to linux 4.x.
https://github.com/Freescale/linux-fslc.git
https://github.com/Freescale/u-boot-fslc.git

On Wed, Aug 5, 2015 at 8:41 AM, Nikolay Dimitrov <picmaster@mail.bg> wrote:
> Hi Justin,
>
> Please check this Yocto discussion from May 2015:
>
> https://lists.yoctoproject.org/pipermail/meta-freescale/2015-May/013953.html
>
> Regards,
> Nikolay

Re: help with linux-fslc 3.18.7 stops at "Uncompressing Linux... done, booting the kernel"

[Nikolay Dimitrov]

Hi Justin,

On 08/05/2015 06:37 PM, justin chaise wrote:
> Thanks Nikolay,
> It looks like that discussion was about a 'missing' dtb file, device
> tree therefor no terminal to display kernel bootup info.
>
> I use the command in u-boot to pass the blob location in sdram.
> bootz 0x40400000 - 0x40700000
> my boot arguments are
> bootargs=earlyprintk console=ttyAMA0,115200n8  mem=nopentium
>
> I dont think that the kernel ever gets to that point because it seem
> to lockup when the mmu is enabled.
> head.S - command
> mcr    p15, 0, r0, c1, c0, 0        @ write control reg

I'm not an assembly/MMU guru, but if this opcode is executed properly
on another imx233 board (like the Olinuxino), this could probably means
that the 8MB memory is too small? I've never worked on project with
such tight memory budget and can't confirm how easy is to get things
working there.

>
> To see what would happen I did comment out that line and the kernel
> continued on for a little while, finding the device tree blob.
> All of my debugging says that this line locks up the cpu.
> I don't believe that the kernel ever gets to the point of using the blob.
> Am I completely wrong here?

Hmm. Can you please check the kernels for Olinuxino boards (the
imx233-based ones) in Yocto and Buildroot:

Yocto, branch fido: linux-4.1
Buildroot, branch master: linux-3.18.2

If you have any of these boards handy (imx233-olinuxino-maxi, imx233-
olinuxino-mini, imx233-olinuxino-micro, imx233-olinuxino-nano) you can
build yocto/buildroot image and test whether it boots OK, and then you
can compare the DTs with yours (you can also compare the board
schematics if you need).

>
> I have not updated my code from linux-fslc since June (30 days old
> code) this year because it looks like a lot of changes are going on to
> up to linux 4.x.
> https://github.com/Freescale/linux-fslc.git
> https://github.com/Freescale/u-boot-fslc.git
>
> On Wed, Aug 5, 2015 at 8:41 AM, Nikolay Dimitrov <picmaster@mail.bg> wrote:
>> Hi Justin,
>>
>> Please check this Yocto discussion from May 2015:
>>
>> https://lists.yoctoproject.org/pipermail/meta-freescale/2015-May/013953.html
>>
>> Regards,
>> Nikolay
>
>
>

Regards,
Nikolay