This grabs the serial number shown in cpuinfo from the serial-number devicetree
property in priority. When booting with ATAGs (and without device-tree), the
provided number is still shown instead.
Signed-off-by: Paul Kocialkowski <contact@xxxxxxxx>
---
arch/arm/include/asm/system_info.h | 1 +
arch/arm/kernel/setup.c | 23 +++++++++++++++++++++--
2 files changed, 22 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/system_info.h b/arch/arm/include/asm/system_info.h
index 720ea03..3860cbd40 100644
--- a/arch/arm/include/asm/system_info.h
+++ b/arch/arm/include/asm/system_info.h
@@ -17,6 +17,7 @@
/* information about the system we're running on */
extern unsigned int system_rev;
+extern const char *system_serial;
extern unsigned int system_serial_low;
extern unsigned int system_serial_high;
extern unsigned int mem_fclk_21285;
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 1d60beb..b501754 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -93,6 +93,9 @@ unsigned int __atags_pointer __initdata;
unsigned int system_rev;
EXPORT_SYMBOL(system_rev);
+const char *system_serial;
+EXPORT_SYMBOL(system_serial);
+
unsigned int system_serial_low;
EXPORT_SYMBOL(system_serial_low);
@@ -821,8 +824,25 @@ arch_initcall(customize_machine);
static int __init init_machine_late(void)
{
+ struct device_node *root;
+ int ret;
+
if (machine_desc->init_late)
machine_desc->init_late();
+
+ root = of_find_node_by_path("/");
+ if (root) {
+ ret = of_property_read_string(root, "serial-number",
+ &system_serial);
+ if (ret)
+ system_serial = NULL;
+ }
+
+ if (!system_serial)
+ system_serial = kasprintf(GFP_KERNEL, "%08x%08x",
+ system_serial_high,
+ system_serial_low);
+
return 0;
}
late_initcall(init_machine_late);
@@ -1091,8 +1111,7 @@ static int c_show(struct seq_file *m, void *v)
seq_printf(m, "Hardware\t: %s\n", machine_name);
seq_printf(m, "Revision\t: %04x\n", system_rev);
- seq_printf(m, "Serial\t\t: %08x%08x\n",
- system_serial_high, system_serial_low);
+ seq_printf(m, "Serial\t\t: %s\n", system_serial);
return 0;
}
--
1.9.1
--
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