Merge branch 'master' into next

Signed-off-by: Tom Rini <trini@konsulko.com>

common/Kconfig

@@ -809,6 +809,20 @@ config TPL_STACKPROTECTOR
 	bool "Stack Protector buffer overflow detection for TPL"
 	depends on STACKPROTECTOR && TPL
 
+config BOARD_RNG_SEED
+	bool "Provide /chosen/rng-seed property to the linux kernel"
+	help
+	  Selecting this option requires the board to define a
+	  board_rng_seed() function, which should return a buffer
+	  which will be used to populate the /chosen/rng-seed property
+	  in the device tree for the OS being booted.
+
+	  It is up to the board code (and more generally the whole
+	  BSP) where and how to store (or generate) such a seed, how
+	  to ensure a given seed is only used once, how to create a
+	  new seed for use on subsequent boots, and whether or not the
+	  kernel should account any entropy from the given seed.
+
 endmenu
 
 menu "Update support"

common/console.c

@@ -600,6 +600,9 @@ static void pre_console_putc(const char c)
 {
 	char *buffer;
 
+	if (gd->precon_buf_idx < 0)
+		return;
+
 	buffer = map_sysmem(CONFIG_VAL(PRE_CON_BUF_ADDR), CONFIG_VAL(PRE_CON_BUF_SZ));
 
 	buffer[CIRC_BUF_IDX(gd->precon_buf_idx++)] = c;
@@ -609,13 +612,16 @@ static void pre_console_putc(const char c)
 
 static void pre_console_puts(const char *s)
 {
+	if (gd->precon_buf_idx < 0)
+		return;
+
 	while (*s)
 		pre_console_putc(*s++);
 }
 
 static void print_pre_console_buffer(int flushpoint)
 {
-	unsigned long in = 0, out = 0;
+	long in = 0, out = 0;
 	char buf_out[CONFIG_VAL(PRE_CON_BUF_SZ) + 1];
 	char *buf_in;
 
@@ -632,6 +638,7 @@ static void print_pre_console_buffer(int flushpoint)
 
 	buf_out[out] = 0;
 
+	gd->precon_buf_idx = -1;
 	switch (flushpoint) {
 	case PRE_CONSOLE_FLUSHPOINT1_SERIAL:
 		puts(buf_out);
@@ -640,6 +647,7 @@ static void print_pre_console_buffer(int flushpoint)
 		console_puts_select(stdout, false, buf_out);
 		break;
 	}
+	gd->precon_buf_idx = in;
 }
 #else
 static inline void pre_console_putc(const char c) {}

common/fdt_support.c

@@ -7,6 +7,7 @@
  */
 
 #include <common.h>
+#include <abuf.h>
 #include <env.h>
 #include <log.h>
 #include <mapmem.h>
@@ -279,6 +280,7 @@ __weak char *board_fdt_chosen_bootargs(void)
 
 int fdt_chosen(void *fdt)
 {
+	struct abuf buf = {};
 	int   nodeoffset;
 	int   err;
 	char  *str;		/* used to set string properties */
@@ -294,6 +296,17 @@ int fdt_chosen(void *fdt)
 	if (nodeoffset < 0)
 		return nodeoffset;
 
+	if (IS_ENABLED(CONFIG_BOARD_RNG_SEED) && !board_rng_seed(&buf)) {
+		err = fdt_setprop(fdt, nodeoffset, "rng-seed",
+				  abuf_data(&buf), abuf_size(&buf));
+		abuf_uninit(&buf);
+		if (err < 0) {
+			printf("WARNING: could not set rng-seed %s.\n",
+			       fdt_strerror(err));
+			return err;
+		}
+	}
+
 	str = board_fdt_chosen_bootargs();
 
 	if (str) {