openwrt/target/linux/ath25/patches-5.15/140-redboot_boardconfig.patch

--- a/drivers/mtd/parsers/redboot.c
+++ b/drivers/mtd/parsers/redboot.c
@@ -16,6 +16,8 @@
 #include <linux/mtd/partitions.h>
 #include <linux/module.h>
 
+#define BOARD_CONFIG_PART		"boardconfig"
+
 struct fis_image_desc {
 	unsigned char name[16];      // Null terminated name
 	u32	  flash_base;    // Address within FLASH of image
@@ -73,6 +75,7 @@ static int parse_redboot_partitions(stru
 				    const struct mtd_partition **pparts,
 				    struct mtd_part_parser_data *data)
 {
+	unsigned long max_offset = 0;
 	int nrparts = 0;
 	struct fis_image_desc *buf;
 	struct mtd_partition *parts;
@@ -239,14 +242,15 @@ nogood:
 		}
 	}
 #endif
-	parts = kzalloc(sizeof(*parts) * nrparts + nulllen + namelen, GFP_KERNEL);
+	parts = kzalloc(sizeof(*parts) * (nrparts + 1) + nulllen + namelen +
+			sizeof(BOARD_CONFIG_PART), GFP_KERNEL);
 
 	if (!parts) {
 		ret = -ENOMEM;
 		goto out;
 	}
 
-	nullname = (char *)&parts[nrparts];
+	nullname = (char *)&parts[nrparts + 1];
 #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
 	if (nulllen > 0)
 		strcpy(nullname, nullstring);
@@ -264,6 +268,8 @@ nogood:
 	}
 #endif
 	for ( ; i < nrparts; i++) {
+		if (max_offset < buf[i].flash_base + buf[i].size)
+				max_offset = buf[i].flash_base + buf[i].size;
 		parts[i].size = fl->img->size;
 		parts[i].offset = fl->img->flash_base;
 		parts[i].name = names;
@@ -297,6 +303,13 @@ nogood:
 		fl = fl->next;
 		kfree(tmp_fl);
 	}
+	if (master->size - max_offset >= master->erasesize) {
+		parts[nrparts].size = master->size - max_offset;
+		parts[nrparts].offset = max_offset;
+		parts[nrparts].name = names;
+		strcpy(names, BOARD_CONFIG_PART);
+		nrparts++;
+	}
 	ret = nrparts;
 	*pparts = parts;
  out: