1 files changed, 60 insertions, 0 deletions

diff --git a/mtdutils/rk3xhack.c b/mtdutils/rk3xhack.c
new file mode 100644
index 000000000..930f60593
--- /dev/null
+++ b/mtdutils/rk3xhack.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2013, Sergey 'Jin' Bostandzhyan
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* This is a hack for Rockchip rk3x based devices. The problem is that
+ * the MEMERASE ioctl is failing (hangs and never returns) in their kernel.
+ * The sources are not fully available, so fixing it in the rk30xxnand_ko driver
+ * is not possible.
+ *
+ * I straced the stock recovery application and it seems to avoid this
+ * particular ioctl, instead it is simply writing zeroes using the write() call.
+ *
+ * This workaround does the same and will replace all MEMERASE occurances in
+ * the recovery code.
+ */
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "rk3xhack.h"
+
+int rk30_zero_out(int fd, off_t pos, ssize_t size)
+{
+    if (lseek(fd, pos, SEEK_SET) != pos) {
+        fprintf(stderr, "mtd: erase failure at 0x%08lx (%s)\n",
+                pos, strerror(errno));
+        return -1;
+    }
+
+    unsigned char *zb = (unsigned char *)calloc(1, size);
+    if (zb == NULL) {
+        fprintf(stderr, "mtd: erase failure, could not allocate memory\n");
+        return -1;
+    }
+
+    if (write(fd, zb, size) != size) {
+        fprintf(stderr, "mtd: erase failure at 0x%08lx (%s)\n",
+                pos, strerror(errno));
+        free(zb);
+        return -1;
+    }
+
+    free(zb);
+    return 0;
+}