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From: Darren Stevens <darren@stevens-zone.net>
To: linuxppc-dev@lists.ozlabs.org
Cc: Christian Zigotzky <chzigotzky@xenosoft.de>,
	rtd@a-eon.com, Pat Wall <pjwall@mac.com>,
	aperez@alexperez.com
Subject: [PATCH] powerpc/pasemi/nemo: Fix low memory values for boot.
Date: Fri, 20 Jan 2017 17:46:13 +0000 (GMT)	[thread overview]
Message-ID: <49760dd82b0.759fd78a@auth.smtp.1and1.co.uk> (raw)

Commit 5c0484e25ec0 ('powerpc: Endian safe trampoline') added a
macro 'FIXUP_ENDIAN' to head_64.S. The CFE on Nemo has a bug 
that shows up when this is included, the system hangs right after
printing the initial memory map, before the CPU's are started.

Clearing the long long at addr 8 has been shown to fix this, so
add an initalisation to head_64.S so the system will boot.

Signed-off-by: Darren Stevens <darren@stevens-zone.net>

---

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 1dc5eae..032b317 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -79,6 +79,13 @@ _GLOBAL(__start)
    /* NOP this out unconditionally */
 BEGIN_FTR_SECTION
    FIXUP_ENDIAN
+#ifdef CONFIG_PPC_PASEMI_NEMO
+   /*
+    * Zero address 8 so Nemo will boot
+    */
+   li  r0,0
+   std 0,8(0)
+#endif
    b   __start_initialization_multiplatform
 END_FTR_SECTION(0, 1)
 

             reply	other threads:[~2017-01-20 18:04 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-20 17:46 Darren Stevens [this message]
2017-01-20 20:22 ` [PATCH] powerpc/pasemi/nemo: Fix low memory values for boot Segher Boessenkool
2017-01-23  6:15 ` Michael Ellerman
2017-01-23 19:15   ` Darren Stevens
2017-01-24  4:46     ` Michael Ellerman

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