ppc440 and i2c
wd at denx.de
Tue Nov 18 19:09:02 EST 2003
In message <20031118071829.43116.qmail at web40301.mail.yahoo.com> you wrote:
> I am running ppc440 with linux kernel version 2.4
Grrrghh... You sent the same message twice to the (dead)
PPCBoot-Users list and another time to linuxppc-embedded???
Grrrrghhh!!!! Please fix your posting habits.
> >From the i2c bus trace it looks like in this
> situation ppc440 keeps issuing the clock pulses
> until the data line SDL is released by the slave
> but following that the SCL line is held low
> by ppc440 and is never released or set to IDLE?
> Is this the expected behaviour if the SDL is held
> low when the ppc440 comes up.
This is an expected and documented problem. See "doc/I2C_Edge_Conditions" in
the U-Boot / PPCBoot sources.
> Is there anyway I can fix this in the ppcboot code.
Yes. You could back-port the fixes that went into U-Boot. But it
probably makes more sense to switch to U-Boot instead.
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
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