sandbox: Allow reading/writing of RAM buffer

It is useful to be able to save and restore the RAM contents of sandbox
U-Boot either for setting up tests, for later analysys, or for chaining
together multiple tests which need to keep the same memory contents.

Add a function to provide a memory file for U-Boot. This is read on
start-up and written when shutting down. If the file does not exist
on start-up, it will be created when shutting down.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 20 insertions, 2 deletions

diff --git a/arch/sandbox/cpu/start.c b/arch/sandbox/cpu/start.c
index 579ece4..452f2a9 100644
--- a/arch/sandbox/cpu/start.c
+++ b/arch/sandbox/cpu/start.c
@@ -4,12 +4,11 @@
  */
 
 #include <common.h>
+#include <os.h>
 #include <asm/getopt.h>
 #include <asm/sections.h>
 #include <asm/state.h>
 
-#include <os.h>
-
 DECLARE_GLOBAL_DATA_PTR;
 
 int sandbox_early_getopt_check(void)
@@ -108,6 +107,25 @@ static int sandbox_cmdline_cb_interactive(struct sandbox_state *state,
 
 SANDBOX_CMDLINE_OPT_SHORT(interactive, 'i', 0, "Enter interactive mode");
 
+static int sandbox_cmdline_cb_memory(struct sandbox_state *state,
+				     const char *arg)
+{
+	int err;
+
+	/* For now assume we always want to write it */
+	state->write_ram_buf = true;
+	state->ram_buf_fname = arg;
+
+	if (os_read_ram_buf(arg)) {
+		printf("Failed to read RAM buffer\n");
+		return err;
+	}
+
+	return 0;
+}
+SANDBOX_CMDLINE_OPT_SHORT(memory, 'm', 1,
+			  "Read/write ram_buf memory contents from file");
+
 int main(int argc, char *argv[])
 {
 	struct sandbox_state *state;