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authorMatt Mower <mowerm@gmail.com>2014-07-09 11:50:05 -0500
committerTom Marshall <tdm@cyngn.com>2015-11-25 15:35:47 -0800
commitbea646deee644f24384caf321fb497dd530ba2f0 (patch)
treec9b03a2d069a730214148d17088f8e97c0dbc521
parent62718eb5237a9f60f05aaf10029c6336c3f8d53f (diff)
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Do not wipe block misc on bootloader msg update
When set_bootloader_message_block() is called, it fopens /misc in write binary mode, wiping all contents other than what is being written. The bootloader msg structure is only 1024+32+32 bytes, so some manufacturers store more than just a bootloader msg on /misc. fopen in read+append mode so that only the bootloader msg is written and the rest of the partition is left untouched. Change-Id: I2d2fbdf067282744864a19d404ca7dc12f688a98
-rw-r--r--bootloader.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/bootloader.cpp b/bootloader.cpp
index 779ae1b..dec296f 100644
--- a/bootloader.cpp
+++ b/bootloader.cpp
@@ -185,7 +185,7 @@ static int get_bootloader_message_block(struct bootloader_message *out,
static int set_bootloader_message_block(const struct bootloader_message *in,
const Volume* v) {
wait_for_device(v->blk_device);
- FILE* f = fopen(v->blk_device, "wb");
+ FILE* f = fopen(v->blk_device, "rb+");
if (f == NULL) {
LOGE("Can't open %s\n(%s)\n", v->blk_device, strerror(errno));
return -1;