FW: Barebox on Karo TX25

Sascha Hauer s.hauer at pengutronix.de
Tue Dec 3 04:26:54 EST 2013

BTW Please don't top-post.

On Mon, Dec 02, 2013 at 09:13:31AM +0000, John Parker wrote:
> Hi again
> So now my problem is that I really could do with the LED and UBIFS stuff that happened since February.
> Should I try to fix mx25 in the latest code, or undo the problematic commit?

Well preferably you should fix the latest code and send a patch to make
it work again ;) However, that could become tricky. For doing so the
patch to enable the debug UART early may become useful. With this you
can use putc_ll and puthex_ll in early code.

I did some investigation. What happens here is really strange. First I
added a missing instruction cache invalidation. That alone doesn't fix
the problem. Inserting a nop fixes booting for me, see the attached
patch. If I move the nop up in the code it still works. If I move it
down, then the board does not work. I have no idea what's happening here


>From 1bf9ced65ffcfc452957a68060a0e3f56ef3f023 Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer at pengutronix.de>
Date: Tue, 3 Dec 2013 10:22:07 +0100
Subject: [PATCH] ARM: tx25: Make it boot by inserting a nop


Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
 arch/arm/boards/karo-tx25/lowlevel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boards/karo-tx25/lowlevel.c b/arch/arm/boards/karo-tx25/lowlevel.c
index d010043..cf6295b 100644
--- a/arch/arm/boards/karo-tx25/lowlevel.c
+++ b/arch/arm/boards/karo-tx25/lowlevel.c
@@ -121,6 +121,8 @@ void __bare_init __naked barebox_arm_reset_vector(void)
 	/* set to 3.3v SDRAM */
 	writel(0x800, MX25_IOMUXC_BASE_ADDR + 0x454);
+	asm volatile ("nop;"::);
 	while (!(readl(MX25_ESDCTL_BASE_ADDR + IMX_ESDMISC) & (1 << 31)));



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