[U-Boot-Users] Does CFG_CMD_SDRAM only use for SDRAM DIMMs?

[U-Boot-Users] Does CFG_CMD_SDRAM only use for SDRAM DIMMs?

[Sam Song]

Hi all,

I met an understanding problem on CFG_CMD_SDRAM. Some
text around the code say "The SDRAM command is
separately configured because many (most?) embedded 
boards don't use SDRAM DIMMs".

I added this command for RPXlite DW but didn't get 
any extra command or message about it.

So what's the good out of the config for a qualified
board? Is it enough to know this configuration is only
for several boards?

Thanks,

Sam


Best regards,

Sam

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[U-Boot-Users] Does CFG_CMD_SDRAM only use for SDRAM DIMMs?

[Wolfgang Denk]

In message <20050331144625.79609.qmail@web15907.mail.cnb.yahoo.com> you wrote:
> 
> I met an understanding problem on CFG_CMD_SDRAM. Some

You are expected to check the README before posting.

It says:

	CFG_CMD_SDRAM   * print SDRAM configuration information

What exactly is not clear about this message?


Best regards,

Wolfgang Denk

-- 
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[U-Boot-Users] Does CFG_CMD_SDRAM only use for SDRAM DIMMs?

[Sam Song]

Wolfgang Denk <wd@denx.de> wrote:
> > I met an understanding problem on CFG_CMD_SDRAM.
> 
> You are expected to check the README before posting.

I did:-)

> It says:
> 
> 	CFG_CMD_SDRAM   * print SDRAM configuration
> information
> 
> What exactly is not clear about this message?

The exactly unclear point is that how can I get the 
print message. In which way? From u-boot boot message
or use a special command to do it? To be frank, I 
really didn't see any extra SDRAM message in boot-up
or related u-boot command when I enabled this 
configuration.

Thanks very much,

Sam

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[U-Boot-Users] Does CFG_CMD_SDRAM only use for SDRAM DIMMs?

[Frank]

isdram...

--- Sam Song <samsongshu@yahoo.com.cn> wrote:
> Wolfgang Denk <wd@denx.de> wrote:
> > > I met an understanding problem on CFG_CMD_SDRAM.
> > 
> > You are expected to check the README before
> posting.
> 
> I did:-)
> 
> > It says:
> > 
> > 	CFG_CMD_SDRAM   * print SDRAM configuration
> > information
> > 
> > What exactly is not clear about this message?
> 
> The exactly unclear point is that how can I get the 
> print message. In which way? From u-boot boot
> message
> or use a special command to do it? To be frank, I 
> really didn't see any extra SDRAM message in boot-up
> or related u-boot command when I enabled this 
> configuration.
> 
> Thanks very much,
> 
> Sam
> 
>
_________________________________________________________
> Do You Yahoo!?
> 150????MP3????????????????????????
>
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>
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>
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> 
> 
>
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[U-Boot-Users] Does CFG_CMD_SDRAM only use for SDRAM DIMMs?

[Sam Song]

Frank <frannk_m1@yahoo.com> wrote:
> isdram...

Thanks for this hint. Uh, but my problem came out of
lacking the related configuration "CFG_CMD_I2C". From 
common/cmd_i2c.c, CFG_CMD_SDRAM is included in the
body
of CFG_CMD_I2C:-)

> > Wolfgang Denk <wd@denx.de> wrote:
> > > You are expected to check the README before
> > > posting.
> > 
> > I did:-)

Uhmmm, I didn't read the code:-(

> > > It says:
> > > 
> > > 	CFG_CMD_SDRAM   * print SDRAM configuration
> > > information

Well, should we add a note beside it like 
"Must be used with CFG_CMD_I2C" to show their
relationship?

Best regards,

Sam

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[U-Boot-Users] Does CFG_CMD_SDRAM only use for SDRAM DIMMs?

[Wolfgang Denk]

In message <20050402075050.98724.qmail@web15908.mail.cnb.yahoo.com> you wrote:
>
> > > > 	CFG_CMD_SDRAM   * print SDRAM configuration information
> 
> Well, should we add a note beside it like 
> "Must be used with CFG_CMD_I2C" to show their
> relationship?

Good idea. Submit a patch?

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
An age is called Dark not because  the  light  fails  to  shine,  but
because people refuse to see it.           -- James Michener, "Space"

[U-Boot-Users] Does CFG_CMD_SDRAM only use for SDRAM DIMMs?

[Jerry Van Baren]

Wolfgang Denk wrote:
> In message <20050402075050.98724.qmail@web15908.mail.cnb.yahoo.com> you wrote:
> 
>>>>>	CFG_CMD_SDRAM   * print SDRAM configuration information
>>
>>Well, should we add a note beside it like 
>>"Must be used with CFG_CMD_I2C" to show their
>>relationship?
> 
> 
> Good idea. Submit a patch?
> 
> Best regards,
> 
> Wolfgang Denk

When you are submitting this patch ;-), you might want to add a note 
that this is reading from the standard configuration information from 
the I2C EEPROM on a DIMM memory module.  This command is not useful for 
built-in SDRAM memories (i.e. soldered to the motherboard).

I suspect that applies to Frank and the SDRAM configuration read command 
is not useful for him.  In general, if you have DIMM memory modules, you 
probably have I2C enabled in order to configure them.  Conversely, if 
you don't have I2C, you probably don't have DIMM memory modules and the 
command is useless.  The third case is that you have DIMM memory modules 
but are not using the I2C configuration information out of them... in 
that case you should be adding I2C and the automatic configuration.

gvb