From: "Dale Farnsworth" <dale@farnsworth.org>
To: Andrey Volkov <avolkov@varma-el.com>, linuxppc-embedded@ozlabs.org
Subject: Re: [RFC] MPC5200 Kernel/UBoot PCI problem
Date: Fri, 25 Mar 2005 06:02:44 -0700 [thread overview]
Message-ID: <20050325130244.GA3166@xyzzy> (raw)
In-Reply-To: <424404E2.2030602@varma-el.com>
On Fri, Mar 25, 2005 at 12:32:34PM +0000, Andrey Volkov wrote:
> >Board started, after I add udelay(7) in read/write config. Really strange.
>
> Sylvain, answer was in PCI2.2 specification, not in manual.
>
> Wolfgang, as I see, you use same trick in u-boot, as Sylvain suggested
> to me. IMHO this trick is wrong. Below I explain why.
>
> When I insert udelay(1000) after deassertion of RST# (write 0 to PR of
> PCIGSCR), AND remove ALL delays from read/write config, board started
> too ;). Hence problem not in the MPC, but in slow board(s) (re)start
> (I was lucky with my board, because udelay must be 1000000).
Good catch Andrey!
-Dale
next prev parent reply other threads:[~2005-03-25 13:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-21 23:06 [PATCH 0/6] [RFC] Change MPC52xx to platform bus / ppc_sys model Sylvain Munaut
2005-03-21 23:07 ` [PATCH 1/6] ppc32: Remove unnecessary test in MPC52xx reset code Sylvain Munaut
2005-03-21 23:07 ` [PATCH 2/6] ppc32: Remove the OCP system from the Freescale MPC52xx support Sylvain Munaut
2005-03-21 23:08 ` [PATCH 3/6] ppc32: Change constants style in Freescale MPC52xx related code Sylvain Munaut
2005-03-21 23:08 ` [PATCH 4/6] ppc32: Add platform bus / ppc_sys model to Freescale MPC52xx Sylvain Munaut
2005-03-25 15:15 ` Kumar Gala
2005-03-21 23:09 ` [PATCH 5/6] serial: Update mpc52xx_uart.c to use platform bus Sylvain Munaut
2005-03-21 23:09 ` [PATCH 6/6] ppc32: Adds necessary cpu init to use USB on LITE5200 Platform Sylvain Munaut
2005-03-22 1:11 ` [PATCH 0/6] [RFC] Change MPC52xx to platform bus / ppc_sys model Kumar Gala
2005-03-22 7:12 ` Sylvain Munaut
2005-03-24 8:37 ` [RFC] MPC5200 PCI problem Andrey Volkov
2005-03-24 14:34 ` Sylvain Munaut
2005-03-24 18:58 ` Andrey Volkov
2005-03-25 12:32 ` [RFC] MPC5200 Kernel/UBoot " Andrey Volkov
2005-03-25 13:02 ` Dale Farnsworth [this message]
2005-03-25 14:00 ` Sylvain Munaut
2005-03-22 7:04 ` Future of OCP Lawrence E. Bakst
2005-03-22 7:48 ` Eugene Surovegin
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