src/bcm_tag.h

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #ifndef __BCM63XX_TAG_H
   3 #define __BCM63XX_TAG_H
   4
   5 #define TAGVER_LEN 4                   /* Length of Tag Version */
   6 #define TAGLAYOUT_LEN 4                /* Length of FlashLayoutVer */
   7 #define SIG1_LEN 20                    /* Company Signature 1 Length */
   8 #define SIG2_LEN 14                    /* Company Signature 2 Lenght */
   9 #define BOARDID_LEN 16                 /* Length of BoardId */
  10 #define ENDIANFLAG_LEN 2               /* Endian Flag Length */
  11 #define CHIPID_LEN 6                   /* Chip Id Length */
  12 #define IMAGE_LEN 10                   /* Length of Length Field */
  13 #define ADDRESS_LEN 12                 /* Length of Address field */
  14 #define DUALFLAG_LEN 2                 /* Dual Image flag Length */
  15 #define INACTIVEFLAG_LEN 2             /* Inactie Flag Length */
  16 #define RSASIG_LEN 20                  /* Length of RSA Signature in tag */
  17 #define TAGINFO1_LEN 30                /* Length of vendor information field1 in tag */
  18 #define FLASHLAYOUTVER_LEN 4           /* Length of Flash Layout Version String tag */
  19 #define TAGINFO2_LEN 16                /* Length of vendor information field2 in tag */
  20 #define CRC_LEN 4                      /* Length of CRC in bytes */
  21 #define ALTTAGINFO_LEN 54              /* Alternate length for vendor information; Pirelli */
  22
  23 #define NUM_PIRELLI 2
  24 #define IMAGETAG_CRC_START              0xFFFFFFFF
  25
  26 #define PIRELLI_BOARDS { \
  27   "AGPF-S0", \
  28   "DWV-S0", \
  29 }
  30
  31 /*
  32  * The broadcom firmware assumes the rootfs starts the image,
  33  * therefore uses the rootfs start (flashImageAddress)
  34  * to determine where to flash the image.  Since we have the kernel first
  35  * we have to give it the kernel address, but the crc uses the length
  36  * associated with this address (rootLength), which is added to the kernel
  37  * length (kernelLength) to determine the length of image to flash and thus
  38  * needs to be rootfs + deadcode (jffs2 EOF marker)
  39 */
  40
  41 struct bcm_tag {
  42         char tagVersion[TAGVER_LEN];           // 0-3: Version of the image tag
  43         char sig_1[SIG1_LEN];                  // 4-23: Company Line 1
  44         char sig_2[SIG2_LEN];                  // 24-37: Company Line 2
  45         char chipid[CHIPID_LEN];               // 38-43: Chip this image is for
  46         char boardid[BOARDID_LEN];             // 44-59: Board name
  47         char big_endian[ENDIANFLAG_LEN];       // 60-61: Map endianness -- 1 BE 0 LE
  48         char totalLength[IMAGE_LEN];           // 62-71: Total length of image
  49         char cfeAddress[ADDRESS_LEN];          // 72-83: Address in memory of CFE
  50         char cfeLength[IMAGE_LEN];             // 84-93: Size of CFE
  51         char flashImageStart[ADDRESS_LEN];     // 94-105: Address in memory of image start (kernel for OpenWRT, rootfs for stock firmware)
  52         char flashRootLength[IMAGE_LEN];            // 106-115: Size of rootfs for flashing
  53         char kernelAddress[ADDRESS_LEN];       // 116-127: Address in memory of kernel
  54         char kernelLength[IMAGE_LEN];          // 128-137: Size of kernel
  55         char dualImage[DUALFLAG_LEN];          // 138-139: Unused at present
  56         char inactiveFlag[INACTIVEFLAG_LEN];   // 140-141: Unused at present
  57         char rsa_signature[RSASIG_LEN];        // 142-161: RSA Signature (unused at present; some vendors may use this)
  58         char information1[TAGINFO1_LEN];       // 162-191: Compilation and related information (not generated/used by OpenWRT)
  59         char flashLayoutVer[FLASHLAYOUTVER_LEN];// 192-195: Version flash layout
  60         char fskernelCRC[CRC_LEN];             // 196-199: kernel+rootfs CRC32
  61         char information2[TAGINFO2_LEN];       // 200-215: Unused at present except Alice Gate where is is information
  62         char imageCRC[CRC_LEN];                // 216-219: CRC32 of image less imagetag (kernel for Alice Gate)
  63         char rootfsCRC[CRC_LEN];               // 220-223: CRC32 of rootfs partition
  64         char kernelCRC[CRC_LEN];               // 224-227: CRC32 of kernel partition
  65         char imageSequence[4];                 // 228-231: Image sequence number
  66         char rootLength[4];                    // 232-235: steal from reserved1 to keep the real root length so we can use in the flash map even after we have change the rootLength to 0 to satisfy devices that check CRC on every boot
  67         char headerCRC[CRC_LEN];               // 236-239: CRC32 of header excluding tagVersion
  68         char reserved2[16];                    // 240-255: Unused at present
  69 };
  70
  71 #endif /* __BCM63XX_TAG_H */