Index: kernel/arch/sparc64/src/sun4u/sparc64.c
===================================================================
--- kernel/arch/sparc64/src/sun4u/sparc64.c	(revision 96b02eb9b2f96f3843b8275c254c43a9cb6c8c88)
+++ kernel/arch/sparc64/src/sun4u/sparc64.c	(revision 6eb794aa8b215fdc5cb202ffc13bae94b06623b0)
@@ -50,4 +50,5 @@
 #include <ddi/irq.h>
 #include <str.h>
+#include <sysinfo/sysinfo.h>
 
 memmap_t memmap;
@@ -111,4 +112,10 @@
 void arch_post_smp_init(void)
 {
+	/* Currently the only supported platform for sparc64/sun4u is 'sun4u'. */
+	static const char *platform = "sun4u";
+
+	sysinfo_set_item_data("platform", NULL, (void *) platform,
+	    str_size(platform));
+
 	standalone_sparc64_console_init();
 }
Index: kernel/arch/sparc64/src/sun4v/sparc64.c
===================================================================
--- kernel/arch/sparc64/src/sun4v/sparc64.c	(revision 96b02eb9b2f96f3843b8275c254c43a9cb6c8c88)
+++ kernel/arch/sparc64/src/sun4v/sparc64.c	(revision 6eb794aa8b215fdc5cb202ffc13bae94b06623b0)
@@ -52,4 +52,5 @@
 #include <str.h>
 #include <arch/drivers/niagara.h>
+#include <sysinfo/sysinfo.h>
 
 memmap_t memmap;
@@ -109,4 +110,10 @@
 void arch_post_smp_init(void)
 {
+	/* Currently the only supported platform for sparc64/sun4v is 'sun4v'. */
+	static const char *platform = "sun4v";
+
+	sysinfo_set_item_data("platform", NULL, (void *) platform,
+	    str_size(platform));
+
 	niagarain_init();
 }