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From: tony@atomide.com (Tony Lindgren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] omap4: Fix ULPI PHY init for ES1.0 SDP (Re: 4430SDP boot failure)
Date: Fri, 14 Jan 2011 16:12:55 -0800	[thread overview]
Message-ID: <20110115001254.GU4957@atomide.com> (raw)
In-Reply-To: <20110114235840.GE22505@n2100.arm.linux.org.uk>

* Russell King - ARM Linux <linux@arm.linux.org.uk> [110114 15:58]:
> 
> # ARMv6k
> config CPU_32v6K
>         bool "Support ARM V6K processor extensions" if !SMP
>         depends on CPU_V6 || CPU_V7
>         default y if SMP && !(ARCH_MX3 || ARCH_OMAP2)
> 
> OMAP2 prevents the selection of armv6k support.  This is probably a very
> bad idea if you want to run the resulting kernel on SMP hardware as it
> removes a barrier in the spinlock code and disables the SMP-safe bitops.

I have some ideas to fix this. Unfortunately it will be inefficient
as spinlock.h can be included from modules too :( I was thinking we can
implement dsb_sev in the proc-*.S functions for the unoptimized multi-arm
builds.
 
> The original patch which started turning this off was from the MX3 stuff,
> but without explaination.
> 
> However, OMAP extended this to disabling the select statement for CPU_32v6K
> even if CPU_V7 is set:
> 
>  config CPU_V7
>         bool "Support ARM V7 processor" if ARCH_INTEGRATOR || MACH_REALVIEW_EB |-       select CPU_32v6K
> +       select CPU_32v6K if !ARCH_OMAP2
> 
> Arguably, SMP _requires_ CPU_32v6K to be enabled for a safe kernel, and this
> patch should not have been merged.

The only way we can fix that is do smp_on_up style rewriting of the assembly
during init between CPUv6 and v6K. Want me to do a patch for that?

For the defconfigs, I have a branch where I occasionally compile all
the old removed defconfigs too. And I believe Kevin test compiles various
PM options.

Tony

  reply	other threads:[~2011-01-15  0:12 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20110106170805.GE1198@n2100.arm.linux.org.uk>
     [not found] ` <20110106180030.GA8249@n2100.arm.linux.org.uk>
     [not found]   ` <20110106182023.GV7771@atomide.com>
     [not found]     ` <20110106203238.GH1198@n2100.arm.linux.org.uk>
     [not found]       ` <20110106204053.GA7771@atomide.com>
     [not found]         ` <20110107161230.GR1198@n2100.arm.linux.org.uk>
     [not found]           ` <20110110185209.GC4957@atomide.com>
2011-01-11 23:16             ` [PATCH] omap4: Fix ULPI PHY init for ES1.0 SDP (Re: 4430SDP boot failure) Tony Lindgren
2011-01-13  8:52               ` Anand Gadiyar
2011-01-13  9:15                 ` Russell King - ARM Linux
2011-01-13 15:51                   ` Tony Lindgren
2011-01-13 16:49                     ` Russell King - ARM Linux
2011-01-14 17:29                       ` Tony Lindgren
2011-01-14 19:18                       ` Paul Walmsley
2011-01-14 21:20                         ` Russell King - ARM Linux
2011-01-14 22:07                           ` Paul Walmsley
2011-01-14 23:10                           ` Paul Walmsley
2011-01-14 23:58                             ` Russell King - ARM Linux
2011-01-15  0:12                               ` Tony Lindgren [this message]
2011-01-15  0:25                                 ` Russell King - ARM Linux
2011-01-15  0:37                                   ` Tony Lindgren
2011-01-15 17:04                                     ` Russell King - ARM Linux
2011-01-17  8:35                                       ` Sascha Hauer
2011-02-01 12:55               ` Anand Gadiyar
2011-02-02  1:10                 ` Tony Lindgren
2011-02-02  6:05                   ` Santosh Shilimkar
2011-02-02 19:48                     ` Tony Lindgren
2011-02-03  8:43                       ` Santosh Shilimkar
2011-02-12  8:46                         ` Santosh Shilimkar
2011-02-24 17:38                           ` Tony Lindgren
2011-02-25  5:33                             ` Santosh Shilimkar
2011-02-25 17:49                               ` Tony Lindgren
2011-02-02 18:43                   ` Anand Gadiyar
2011-02-02 19:50                     ` Tony Lindgren

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