topic Re: u-boot and config_evn_extra_setting in i.MX Processors

u-boot and config_evn_extra_setting

netstv — Thu, 29 Oct 2020 09:15:18 GMT

Sorry for the stupid message to the group. I sent it before realizing I needed to add this discussion and not blast everyone an email.

So I have the evk and bootlets and all that good stuff building on my system.

(Ubunutu Linux true (not a vm))

 I use the makefile from the imx-bootlets-src-10.12.01.tar.gz file to create a boot stream from the u-boot elf I built.

The sources of the u-boot are from the ltib (I don't use ltib I have my own build system which I've used for 2 years on the mx25)

I just took the u-boot directory and patches from the ltib.

I load the boot stream onto my evk all fine and dandy with my cool ported usb downloader that runs on

linux.

The one thing that is driving me nuts and maybe someone else has seen this, is that in the

mx28_evk.h I set CONFIG_EXTRA_ENV_SETTINGS to a bunch of nfs boot params so I don't have

to type it in everytime.

When I type printenv at the u-boot prompt I see...

GNET MX28 U-Boot > printenv

stdin=serial

stdout=serial

stderr=serial

ethact=FEC0

ver=U-Boot 2009.08-svn45823 (Aug 30 2011 - 17:04:15)  Environment size: 106/130044 bytes

GNET MX28 U-Boot >

GNET MX28 U-Boot >

Nothing nadda .. nothing of interest to me.

You'll also notice that the CONFIG_SYS_PROMPT works so I know my header file is being picked.

 I even went so far as to hexdump the imx28_ivt_uboot.sb to see if I could find the string and all my

stuff is there.

oiy vey!

I'm sure I'm missing some stupid u-boot #define CONFIG_TURN_THIS_ENV_ON param somewhere.

 I thought I'd ask you guys to see if you've seen this.

Thanks in advance.

 -stv

Re: u-boot and config_evn_extra_setting

dot_bob — Wed, 31 Aug 2011 18:00:38 GMT

Are you null terminating the strings you are supplying to CONFIG_EXTRA_ENV_SETTINGS? Also take note there are string length limitations you have with #define statements which can also limit how much you can define.

Here is a snippet of code from a boot loader of mine

#define CONFIG_EXTRA_ENV_SETTINGS \
         "autoload=n\0" \
         "firstboot=1\0" \
         "calibratets=1\0"

You may also try using the following two defines instead of the CONFIG_EXTRA_ENV_SETTINGS.

Note: these are code snippets from a ARM9 project of mine not using an i.MX28.

#define CONFIG_BOOTARGS "root=/dev/mtdblock5 rw rootfstype=jffs2 console=ttyAM ramdisk_size=4000"
#define CONFIG_BOOTCOMMAND "cp.b 0x600C0000 0xC0080000 0x00400000;bootm 0xC0080000"

-Rob

Re: u-boot and config_evn_extra_setting

netstv — Wed, 31 Aug 2011 18:14:38 GMT

yes on the null terminating.

maybe I'll try your other config_bootargs etc...

I think it may have something to do with the ENV_IS_EMBEDDED... stay tuned... I'll post it once I figure it out.

Re: u-boot and config_evn_extra_setting

netstv — Wed, 31 Aug 2011 18:26:40 GMT

ok .. found it....

#define CONFIG_ENV_IS_EMBEDDED

That does it.

ciao.

Re: u-boot and config_evn_extra_setting

Jean-PaulLePape — Sat, 14 Jan 2012 20:32:05 GMT

Hi,

I would like to build U-BOOT for the i.MX28 EVK board without using LTIB like you did. Could you please give us the steps to perfom that (where to get and copy U-BOOT and apply the patches from LTIB project)

Thanks for your help,

:-)