support using an EMMC misc partition to store recovery arguments
Change-Id: I9f912857cfc6afb8ba764f5541af7f01df029a77
diff --git a/bootloader.c b/bootloader.c
index 38b5651..1e66c3e 100644
--- a/bootloader.c
+++ b/bootloader.c
@@ -25,8 +25,6 @@
static const char *CACHE_NAME = "CACHE:";
static const char *MISC_NAME = "MISC:";
-static const int MISC_PAGES = 3; // number of pages to save
-static const int MISC_COMMAND_PAGE = 1; // bootloader command is this page
#ifdef LOG_VERBOSE
static void dump_data(const char *data, int len) {
@@ -41,6 +39,57 @@
}
#endif
+#ifdef USE_EXT4
+// Strictly speaking this doesn't have anything to do with ext4; we
+// really just mean "misc is an emmc partition". We should have a
+// more configurable way have describing partitions, filesystems, etc.
+
+static const char* MISC_PARTITION =
+ "/dev/block/platform/sdhci-tegra.3/by-name/misc";
+
+int get_bootloader_message(struct bootloader_message* out) {
+ FILE* f = fopen(MISC_PARTITION, "rb");
+ if (f == NULL) {
+ LOGE("Can't open %s\n(%s)\n", MISC_PARTITION, strerror(errno));
+ return -1;
+ }
+ struct bootloader_message temp;
+ int count = fread(&temp, sizeof(temp), 1, f);
+ if (count != 1) {
+ LOGE("Failed reading %s\n(%s)\n", MISC_PARTITION, strerror(errno));
+ return -1;
+ }
+ if (fclose(f) != 0) {
+ LOGE("Failed closing %s\n(%s)\n", MISC_PARTITION, strerror(errno));
+ return -1;
+ }
+ memcpy(out, &temp, sizeof(temp));
+ return 0;
+}
+
+int set_bootloader_message(const struct bootloader_message* in) {
+ FILE* f = fopen(MISC_PARTITION, "wb");
+ if (f == NULL) {
+ LOGE("Can't open %s\n(%s)\n", MISC_PARTITION, strerror(errno));
+ return -1;
+ }
+ int count = fwrite(in, sizeof(*in), 1, f);
+ if (count != 1) {
+ LOGE("Failed writing %s\n(%s)\n", MISC_PARTITION, strerror(errno));
+ return -1;
+ }
+ if (fclose(f) != 0) {
+ LOGE("Failed closing %s\n(%s)\n", MISC_PARTITION, strerror(errno));
+ return -1;
+ }
+ return 0;
+}
+
+#else // MTD partitions
+
+static const int MISC_PAGES = 3; // number of pages to save
+static const int MISC_COMMAND_PAGE = 1; // bootloader command is this page
+
int get_bootloader_message(struct bootloader_message *out) {
size_t write_size;
const MtdPartition *part = get_root_mtd_partition(MISC_NAME);
@@ -119,3 +168,5 @@
LOGI("Set boot command \"%s\"\n", in->command[0] != 255 ? in->command : "");
return 0;
}
+
+#endif