sandbox: Zero the ram buffer on startup

At present the RAM buffer is not inited unless it is read from a file,
likely produced by an earlier phase of U-Boot. This causes valgrind
warnings whenever the RAM buffer is used. Correct this by initing it if
needed.

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

diff --git a/arch/sandbox/cpu/start.c b/arch/sandbox/cpu/start.c
index b1566a8..2f5e6e9 100644 (file)
--- a/arch/sandbox/cpu/start.c
+++ b/arch/sandbox/cpu/start.c
@@ -180,6 +180,7 @@ static int sandbox_cmdline_cb_memory(struct sandbox_state *state,
                printf("Failed to read RAM buffer '%s': %d\n", arg, err);
                return err;
        }
+       state->ram_buf_read = true;
 
        return 0;
 }
@@ -301,6 +302,12 @@ int board_run_command(const char *cmdline)
 
 static void setup_ram_buf(struct sandbox_state *state)
 {
+       /* Zero the RAM buffer if we didn't read it, to keep valgrind happy */
+       if (!state->ram_buf_read) {
+               memset(state->ram_buf, '\0', state->ram_size);
+               printf("clear %p %x\n", state->ram_buf, state->ram_size);
+       }
+
        gd->arch.ram_buf = state->ram_buf;
        gd->ram_size = state->ram_size;
 }

diff --git a/arch/sandbox/include/asm/state.h b/arch/sandbox/include/asm/state.h
index 8fabe70..5a14485 100644 (file)
--- a/arch/sandbox/include/asm/state.h
+++ b/arch/sandbox/include/asm/state.h
@@ -90,6 +90,7 @@ struct sandbox_state {
        bool show_test_output;          /* Don't suppress stdout in tests */
        int default_log_level;          /* Default log level for sandbox */
        bool show_of_platdata;          /* Show of-platdata in SPL */
+       bool ram_buf_read;              /* true if we read the RAM buffer */
 
        /* Pointer to information for each SPI bus/cs */
        struct sandbox_spi_info spi[CONFIG_SANDBOX_SPI_MAX_BUS]