From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wm0-x244.google.com ([2a00:1450:400c:c09::244]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bd1cR-000522-1G for barebox@lists.infradead.org; Thu, 25 Aug 2016 20:51:24 +0000 Received: by mail-wm0-x244.google.com with SMTP id i138so8869052wmf.3 for ; Thu, 25 Aug 2016 13:51:02 -0700 (PDT) References: <1472041390-19259-1-git-send-email-s.hauer@pengutronix.de> From: Peter Kardos Message-ID: Date: Thu, 25 Aug 2016 22:50:50 +0200 MIME-Version: 1.0 In-Reply-To: <1472041390-19259-1-git-send-email-s.hauer@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH] ARM: vector_table: Fix creation of second level page table To: Sascha Hauer , Barebox List Tested with my AT91RM9200 system, v2016.08 + patch; The system starts/boots as expected. If no one objects, we can consider this issue closed/fixed. Peter On 8/24/2016 2:23 PM, Sascha Hauer wrote: > The second level page tables can only start at a 1MiB section boundary, > so instead of calling arm_create_pte() with the high vector address > (which is 0xffff0000, not 1MiB aligned) we have to call it with > 0xfff00000 to correctly create a second level page table. The vectors > themselves worked as expected with the old value, but the memory around > it did not do a 1:1 mapping anymore. This breaks SoCs which have > peripherals in that area, for example Atmel SoCs like the AT91RM9200. > > Fixes: f6b77fe9: ARM: Rework vector table setup > > Reported-by: Peter Kardos > Signed-off-by: Sascha Hauer > --- > arch/arm/cpu/mmu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm/cpu/mmu.c b/arch/arm/cpu/mmu.c > index a31bce4..2b70866 100644 > --- a/arch/arm/cpu/mmu.c > +++ b/arch/arm/cpu/mmu.c > @@ -307,7 +307,7 @@ static void create_vector_table(unsigned long adr) > vectors = xmemalign(PAGE_SIZE, PAGE_SIZE); > pr_debug("Creating vector table, virt = 0x%p, phys = 0x%08lx\n", > vectors, adr); > - exc = arm_create_pte(adr); > + exc = arm_create_pte(adr & ~(SZ_1M - 1)); > idx = (adr & (SZ_1M - 1)) >> PAGE_SHIFT; > exc[idx] = (u32)vectors | PTE_TYPE_SMALL | pte_flags_cached; > } _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox