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bcm_tag.h
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bcm_tag.h
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// SPDX-License-Identifier: GPL-2.0-only
#ifndef __BCM63XX_TAG_H
#define __BCM63XX_TAG_H
#define TAGVER_LEN 4 /* Length of Tag Version */
#define TAGLAYOUT_LEN 4 /* Length of FlashLayoutVer */
#define SIG1_LEN 20 /* Company Signature 1 Length */
#define SIG2_LEN 14 /* Company Signature 2 Lenght */
#define BOARDID_LEN 16 /* Length of BoardId */
#define ENDIANFLAG_LEN 2 /* Endian Flag Length */
#define CHIPID_LEN 6 /* Chip Id Length */
#define IMAGE_LEN 10 /* Length of Length Field */
#define ADDRESS_LEN 12 /* Length of Address field */
#define DUALFLAG_LEN 2 /* Dual Image flag Length */
#define INACTIVEFLAG_LEN 2 /* Inactie Flag Length */
#define RSASIG_LEN 20 /* Length of RSA Signature in tag */
#define TAGINFO1_LEN 30 /* Length of vendor information field1 in tag */
#define FLASHLAYOUTVER_LEN 4 /* Length of Flash Layout Version String tag */
#define TAGINFO2_LEN 16 /* Length of vendor information field2 in tag */
#define CRC_LEN 4 /* Length of CRC in bytes */
#define ALTTAGINFO_LEN 54 /* Alternate length for vendor information; Pirelli */
#define NUM_PIRELLI 2
#define IMAGETAG_CRC_START 0xFFFFFFFF
#define PIRELLI_BOARDS { \
"AGPF-S0", \
"DWV-S0", \
}
/*
* The broadcom firmware assumes the rootfs starts the image,
* therefore uses the rootfs start (flashImageAddress)
* to determine where to flash the image. Since we have the kernel first
* we have to give it the kernel address, but the crc uses the length
* associated with this address (rootLength), which is added to the kernel
* length (kernelLength) to determine the length of image to flash and thus
* needs to be rootfs + deadcode (jffs2 EOF marker)
*/
struct bcm_tag {
char tagVersion[TAGVER_LEN]; // 0-3: Version of the image tag
char sig_1[SIG1_LEN]; // 4-23: Company Line 1
char sig_2[SIG2_LEN]; // 24-37: Company Line 2
char chipid[CHIPID_LEN]; // 38-43: Chip this image is for
char boardid[BOARDID_LEN]; // 44-59: Board name
char big_endian[ENDIANFLAG_LEN]; // 60-61: Map endianness -- 1 BE 0 LE
char totalLength[IMAGE_LEN]; // 62-71: Total length of image
char cfeAddress[ADDRESS_LEN]; // 72-83: Address in memory of CFE
char cfeLength[IMAGE_LEN]; // 84-93: Size of CFE
char flashImageStart[ADDRESS_LEN]; // 94-105: Address in memory of image start (kernel for OpenWRT, rootfs for stock firmware)
char flashRootLength[IMAGE_LEN]; // 106-115: Size of rootfs for flashing
char kernelAddress[ADDRESS_LEN]; // 116-127: Address in memory of kernel
char kernelLength[IMAGE_LEN]; // 128-137: Size of kernel
char dualImage[DUALFLAG_LEN]; // 138-139: Unused at present
char inactiveFlag[INACTIVEFLAG_LEN]; // 140-141: Unused at present
char rsa_signature[RSASIG_LEN]; // 142-161: RSA Signature (unused at present; some vendors may use this)
char information1[TAGINFO1_LEN]; // 162-191: Compilation and related information (not generated/used by OpenWRT)
char flashLayoutVer[FLASHLAYOUTVER_LEN];// 192-195: Version flash layout
char fskernelCRC[CRC_LEN]; // 196-199: kernel+rootfs CRC32
char information2[TAGINFO2_LEN]; // 200-215: Unused at present except Alice Gate where is is information
char imageCRC[CRC_LEN]; // 216-219: CRC32 of image less imagetag (kernel for Alice Gate)
char rootfsCRC[CRC_LEN]; // 220-223: CRC32 of rootfs partition
char kernelCRC[CRC_LEN]; // 224-227: CRC32 of kernel partition
char imageSequence[4]; // 228-231: Image sequence number
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
char headerCRC[CRC_LEN]; // 236-239: CRC32 of header excluding tagVersion
char reserved2[16]; // 240-255: Unused at present
};
#endif /* __BCM63XX_TAG_H */