bareboximd: Use mmap when possibly

It's hard to believe but there are systems out there that are so sparse
with memory that they can't afford 1MiB of RAM to read a file into.
Use mmap when possible and fall back to reading into an allocated buffer
otherwise.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 5 insertions, 1 deletions

diff --git a/common/imd.c b/common/imd.c
index aff3b00b6b..e1d5733c6b 100644
--- a/common/imd.c
+++ b/common/imd.c
@@ -17,6 +17,10 @@ int imd_command_setenv(const char *variable_name, const char *value)
 	return -ENOSYS;
 }
 #endif
+static inline void read_file_2_free(void *buf)
+{
+	free(buf);
+}
 #endif
 
 /*
@@ -542,6 +546,6 @@ int imd_command(int argc, char *argv[])
 
 	ret = 0;
 out:
-	free(buf);
+	read_file_2_free(buf);
 	return ret;
 }