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From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: barebox@lists.infradead.org
Cc: Brian Lilly <brian@crystalfontz.com>
Subject: [PATCH 1/2] cfa-10036: Use the second MMC partition to store the environment
Date: Wed, 13 Feb 2013 17:45:17 +0100	[thread overview]
Message-ID: <1360773918-10663-2-git-send-email-maxime.ripard@free-electrons.com> (raw)
In-Reply-To: <1360773918-10663-1-git-send-email-maxime.ripard@free-electrons.com>

Since the only storage medium on the cfa-10036 is the MMC card, we need
to have a registered environment partition on it if we want to be able
to modify at runtime.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 arch/arm/boards/crystalfontz-cfa10036/cfa10036.c |   44 +++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boards/crystalfontz-cfa10036/cfa10036.c b/arch/arm/boards/crystalfontz-cfa10036/cfa10036.c
index b59dbab..1821b10 100644
--- a/arch/arm/boards/crystalfontz-cfa10036/cfa10036.c
+++ b/arch/arm/boards/crystalfontz-cfa10036/cfa10036.c
@@ -97,9 +97,46 @@ static int cfa10036_mem_init(void)
 }
 mem_initcall(cfa10036_mem_init);
 
+/**
+ * Try to register an environment storage on the attached MCI card
+ * @return 0 on success
+ *
+ * We rely on the existence of a usable SD card, already attached to
+ * our system, to get something like a persistent memory for our environment.
+ * If this SD card is also the boot media, we can use the second partition
+ * for our environment purpose (if present!).
+ */
+static int register_persistant_environment(void)
+{
+	struct cdev *cdev;
+
+	/*
+	 * The CFA-10036 only has one MCI card socket.
+	 * So, we expect its name as "disk0".
+	 */
+	cdev = cdev_by_name("disk0");
+	if (cdev == NULL) {
+		pr_err("No SD card found\n");
+		return -ENODEV;
+	}
+
+	/* MCI card is present, also a useable partition on it? */
+	cdev = cdev_by_name("disk0.1");
+	if (cdev == NULL) {
+		pr_err("No second partition available\n");
+		pr_info("Please create at least a second partition with"
+			" 256 kiB...512 kiB in size (your choice)\n");
+		return -ENODEV;
+	}
+
+	/* use the full partition as our persistent environment storage */
+	return devfs_add_partition("disk0.1", 0, cdev->size,
+						DEVFS_PARTITION_FIXED, "env0");
+}
+
 static int cfa10036_devices_init(void)
 {
-	int i;
+	int i, ret;
 
 	/* initizalize muxing */
 	for (i = 0; i < ARRAY_SIZE(cfa10036_pads); i++)
@@ -124,6 +161,11 @@ static int cfa10036_devices_init(void)
 
 	cfa10036_detect_hw();
 
+	ret = register_persistant_environment();
+	if (ret != 0)
+		printf("Cannot create the 'env0' persistant "
+			 "environment storage (%d)\n", ret);
+
 	return 0;
 }
 device_initcall(cfa10036_devices_init);
-- 
1.7.10.4


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  reply	other threads:[~2013-02-13 16:46 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-13 16:45 [PATCH 0/2] ARM: cfa10036: Store the barebox environment on the MMC Maxime Ripard
2013-02-13 16:45 ` Maxime Ripard [this message]
2013-02-13 17:10   ` [PATCH 1/2] cfa-10036: Use the second MMC partition to store the environment Eric Bénard
2013-02-13 17:12   ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-14  9:52     ` Maxime Ripard
2013-02-14  8:16   ` Juergen Beisert
2013-02-14 10:10     ` Maxime Ripard
2013-02-14 11:17       ` Eric Bénard
2013-02-14 11:56         ` [PATCH 1/3] env: add register_persistent_environment Eric Bénard
2013-02-14 11:56           ` [PATCH 2/3] imx23-olinuxino: swith to generic peristent env Eric Bénard
2013-02-14 11:56           ` [PATCH 3/3] falconwing: switch " Eric Bénard
2013-02-14 12:09             ` Juergen Beisert
2013-02-14 13:20               ` [PATCH v2] " Eric Bénard
2013-02-14 13:50                 ` [PATCH v3] " Eric Bénard
2013-02-14 19:31           ` [PATCH 1/3] env: add register_persistent_environment Sascha Hauer
2013-02-19  9:17             ` [PATCH v4 " Eric Bénard
2013-02-19  9:17               ` [PATCH v4 2/3] imx23-olinuxino: swith to generic peristent env Eric Bénard
2013-02-19  9:17               ` [PATCH v4 3/3] falconwing: switch " Eric Bénard
2013-02-19 11:58               ` [PATCH v4 1/3] env: add register_persistent_environment Jean-Christophe PLAGNIOL-VILLARD
2013-02-19 13:41                 ` Eric Bénard
2013-02-19 15:35                   ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-19 15:49                     ` Eric Bénard
2013-02-19 15:57                       ` Eric Bénard
2013-02-19 19:21                         ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-21  6:55                           ` Eric Bénard
2013-02-21 11:20                             ` Jean-Christophe PLAGNIOL-VILLARD
2013-02-21 13:52               ` Sascha Hauer
2013-02-13 16:45 ` [PATCH 2/2] cfa10036: Update the environment Maxime Ripard
2013-02-26 16:50 [PATCHv2 0/2] ARM: cfa10036: Store the barebox environment on the MMC Maxime Ripard
2013-02-26 16:50 ` [PATCH 1/2] cfa-10036: Use the second MMC partition to store the environment Maxime Ripard

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