From: Sascha Hauer <s.hauer@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/3] ARM: start kernel: find a valid address for the atags list automatically
Date: Fri, 6 Dec 2013 10:42:59 +0100 [thread overview]
Message-ID: <1386322981-30721-2-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1386322981-30721-1-git-send-email-s.hauer@pengutronix.de>
If a board does not specify a place for the atags list default to
SDRAM start + 0x100. The vast majority of boards uses this place
anyway, so the call to armlinux_set_bootparams() can be removed
fo most boards.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
arch/arm/lib/armlinux.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/arch/arm/lib/armlinux.c b/arch/arm/lib/armlinux.c
index 75d751b..d83c6a2 100644
--- a/arch/arm/lib/armlinux.c
+++ b/arch/arm/lib/armlinux.c
@@ -89,6 +89,24 @@ u64 armlinux_get_serial(void)
return armlinux_system_serial;
}
+void armlinux_set_bootparams(void *params)
+{
+ armlinux_bootparams = params;
+}
+
+static struct tag *armlinux_get_bootparams(void)
+{
+ struct memory_bank *mem;
+
+ if (armlinux_bootparams)
+ return armlinux_bootparams;
+
+ for_each_memory_bank(mem)
+ return (void *)mem->start + 0x100;
+
+ BUG();
+}
+
#ifdef CONFIG_ARM_BOARD_APPEND_ATAG
static struct tag *(*atag_appender)(struct tag *);
void armlinux_set_atag_appender(struct tag *(*func)(struct tag *))
@@ -99,7 +117,7 @@ void armlinux_set_atag_appender(struct tag *(*func)(struct tag *))
static void setup_start_tag(void)
{
- params = (struct tag *)armlinux_bootparams;
+ params = armlinux_get_bootparams();
params->hdr.tag = ATAG_CORE;
params->hdr.size = tag_size(tag_core);
@@ -235,11 +253,6 @@ static void setup_tags(unsigned long initrd_address,
}
-void armlinux_set_bootparams(void *params)
-{
- armlinux_bootparams = params;
-}
-
void start_linux(void *adr, int swap, unsigned long initrd_address,
unsigned long initrd_size, void *oftree)
{
@@ -252,7 +265,7 @@ void start_linux(void *adr, int swap, unsigned long initrd_address,
params = oftree;
} else {
setup_tags(initrd_address, initrd_size, swap);
- params = armlinux_bootparams;
+ params = armlinux_get_bootparams();
}
architecture = armlinux_get_architecture();
--
1.8.4.3
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next prev parent reply other threads:[~2013-12-06 9:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-06 9:42 Find ATAG base automatically and call barebox like the kernel Sascha Hauer
2013-12-06 9:42 ` Sascha Hauer [this message]
2013-12-06 14:38 ` [PATCH 1/3] ARM: start kernel: find a valid address for the atags list automatically Alexander Aring
2013-12-06 9:43 ` [PATCH 2/3] ARM: remove armlinux_set_bootparams() calls from boards Sascha Hauer
2013-12-06 9:43 ` [PATCH 3/3] ARM: boot barebox with kernel calling convention Sascha Hauer
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