firmware_flash.c

编译后直接运行的ＭＰ３播放器全部Ｃ语言源代码 一个包含FAT文件系统、系统引导 Boot、FLASH Driver等内容的

/***************************************************************************
*             __________               __   ___.
*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
*                     \/            \/     \/    \/            \/
* $Id: firmware_flash.c,v 1.10 2004/01/08 09:58:58 bagder Exp $
*
* Plugin for reprogramming the whole Flash ROM chip with a new content.
* !!! DON'T MESS WITH THIS CODE UNLESS YOU'RE ABSOLUTELY SHURE WHAT YOU DO !!!
*
* Copyright (C) 2003 J鰎g Hohensohn [IDC]Dragon
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"

#ifndef SIMULATOR /* only for target */

/* define DUMMY if you only want to "play" with the UI, does no harm */
/* #define DUMMY */

#ifndef UINT8
#define UINT8 unsigned char
#endif

#ifndef UINT16
#define UINT16 unsigned short
#endif

#ifndef UINT32
#define UINT32 unsigned long
#endif

/* platform IDs as I have used them in my firmware templates */
#define ID_RECORDER 0
#define ID_FM       1
#define ID_PLAYER   2
#define ID_REC_V2   3

/* Here I have to check for ARCHOS_* defines in source code, which is 
   generally strongly discouraged. But here I'm not checking for a certain 
   feature, I'm checking for the model itself. */
#if defined(ARCHOS_PLAYER)
#define FILE_TYPE "player"
#define KEEP VERSION_ADR /* keep the firmware version */
#define PLATFORM_ID ID_PLAYER
#elif defined(ARCHOS_RECORDER)
#define FILE_TYPE "rec"
#define KEEP MASK_ADR /* keep the mask value */
#define PLATFORM_ID ID_RECORDER
#elif defined(ARCHOS_RECORDERV2)
#define FILE_TYPE "v2"
#define KEEP MASK_ADR /* keep the mask value */
#define PLATFORM_ID ID_REC_V2
#elif defined(ARCHOS_FMRECORDER)
#define FILE_TYPE "fm"
#define KEEP MASK_ADR /* keep the mask value */
#define PLATFORM_ID ID_FM
#else
#undef PLATFORM_ID /* this platform is not (yet) flashable */
#endif

#ifdef PLATFORM_ID

/* result of the CheckFirmwareFile() function */
typedef enum
{
    eOK = 0,
    eFileNotFound, /* errors from here on */
    eTooBig,
    eTooSmall,
    eReadErr,
    eBadContent,
    eCrcErr,
    eBadPlatform,
} tCheckResult;

/* result of the CheckBootROM() function */
typedef enum
{
    eBootROM, /* the supported boot ROM */
    eUnknown, /* unknown boot ROM */
    eROMless, /* flash mapped to zero */
} tCheckROM;

typedef struct 
{
    UINT8 manufacturer;
    UINT8 id;
    int size;
    char name[32];
} tFlashInfo;

static struct plugin_api* rb; /* here is a global api struct pointer */

#define MASK_ADR     0xFC /* position of hardware mask value in Flash */
#define VERSION_ADR  0xFE /* position of firmware version value in Flash */
#define PLATFORM_ADR 0xFB /* position of my platform ID value in Flash */
#define SEC_SIZE 4096 /* size of one flash sector */
static UINT8* sector; /* better not place this on the stack... */
static volatile UINT8* FB = (UINT8*)0x02000000; /* Flash base address */


/***************** Flash Functions *****************/


/* read the manufacturer and device ID */
bool ReadID(volatile UINT8* pBase, UINT8* pManufacturerID, UINT8* pDeviceID)
{
    UINT8 not_manu, not_id; /* read values before switching to ID mode */
    UINT8 manu, id; /* read values when in ID mode */
    
    pBase = (UINT8*)((UINT32)pBase & 0xFFF80000); /* down to 512k align */
    
    /* read the normal content */
    not_manu = pBase[0]; /* should be 'A' (0x41) and 'R' (0x52) */
    not_id   = pBase[1]; /*  from the "ARCH" marker */
    
    pBase[0x5555] = 0xAA; /* enter command mode */
    pBase[0x2AAA] = 0x55;
    pBase[0x5555] = 0x90; /* ID command */
    rb->sleep(HZ/50); /* Atmel wants 20ms pause here */
    
    manu = pBase[0];
    id   = pBase[1];
    
    pBase[0] = 0xF0; /* reset flash (back to normal read mode) */
    rb->sleep(HZ/50); /* Atmel wants 20ms pause here */
    
    /* I assume success if the obtained values are different from
    the normal flash content. This is not perfectly bulletproof, they 
    could theoretically be the same by chance, causing us to fail. */
    if (not_manu != manu || not_id != id) /* a value has changed */
    {
        *pManufacturerID = manu; /* return the results */
        *pDeviceID = id;
        return true; /* success */
    }
    return false; /* fail */
}


/* erase the sector which contains the given address */
bool EraseSector(volatile UINT8* pAddr)
{
#ifdef DUMMY
    (void)pAddr; /* prevents warning */
    return true;
#else
    volatile UINT8* pBase = (UINT8*)((UINT32)pAddr & 0xFFF80000); /* round down to 512k align */
    unsigned timeout = 43000; /* the timeout loop should be no less than 25ms */
    
    pBase[0x5555] = 0xAA; /* enter command mode */
    pBase[0x2AAA] = 0x55;
    pBase[0x5555] = 0x80; /* erase command */
    pBase[0x5555] = 0xAA; /* enter command mode */
    pBase[0x2AAA] = 0x55;
    *pAddr = 0x30; /* erase the sector */

    /* I counted 7 instructions for this loop -> min. 0.58 us per round */
    /* Plus memory waitstates it will be much more, gives margin */
    while (*pAddr != 0xFF && --timeout); /* poll for erased */

    return (timeout != 0);
#endif
}


/* address must be in an erased location */
inline bool ProgramByte(volatile UINT8* pAddr, UINT8 data)
{
#ifdef DUMMY
    (void)pAddr; /* prevents warnings */
    (void)data;
    return true;
#else
    unsigned timeout = 35; /* the timeout loop should be no less than 20us */
    
    if (~*pAddr & data) /* just a safety feature, not really necessary */
        return false; /* can't set any bit from 0 to 1 */
    
    FB[0x5555] = 0xAA; /* enter command mode */
    FB[0x2AAA] = 0x55;
    FB[0x5555] = 0xA0; /* byte program command */
    
    *pAddr = data;
    
    /* I counted 7 instructions for this loop -> min. 0.58 us per round */
    /* Plus memory waitstates it will be much more, gives margin */
    while (*pAddr != data && --timeout); /* poll for programmed */
    
    return (timeout != 0);
#endif
}


/* this returns true if supported and fills the info struct */
bool GetFlashInfo(tFlashInfo* pInfo)
{
    rb->memset(pInfo, 0, sizeof(tFlashInfo));
    
    if (!ReadID(FB, &pInfo->manufacturer, &pInfo->id))
        return false;
    
    if (pInfo->manufacturer == 0xBF) /* SST */
    {
        if (pInfo->id == 0xD6)
        {
            pInfo->size = 256* 1024; /* 256k */
            rb->strcpy(pInfo->name, "SST39VF020");
            return true;
        }
        else if (pInfo->id == 0xD7)
        {
            pInfo->size = 512* 1024; /* 512k */
            rb->strcpy(pInfo->name, "SST39VF040");
            return true;
        }
        else
            return false;
    }
    return false;
}


/*********** Utility Functions ************/


/* Tool function to calculate a CRC32 across some buffer */
/* third argument is either 0xFFFFFFFF to start or value from last piece */
unsigned crc_32(unsigned char* buf, unsigned len, unsigned crc32)
{
    /* CCITT standard polynomial 0x04C11DB7 */
    static const unsigned crc32_lookup[16] = 
    {   /* lookup table for 4 bits at a time is affordable */
        0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9, 
        0x130476DC, 0x17C56B6B, 0x1A864DB2, 0x1E475005, 
        0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6, 0x2B4BCB61, 
        0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD
    };
    
    unsigned char byte;
    unsigned t;

    while (len--)
    {   
        byte = *buf++; /* get one byte of data */

        /* upper nibble of our data */
        t = crc32 >> 28; /* extract the 4 most significant bits */
        t ^= byte >> 4; /* XOR in 4 bits of data into the extracted bits */
        crc32 <<= 4; /* shift the CRC register left 4 bits */     
        crc32 ^= crc32_lookup[t]; /* do the table lookup and XOR the result */

        /* lower nibble of our data */
        t = crc32 >> 28; /* extract the 4 most significant bits */
        t ^= byte & 0x0F; /* XOR in 4 bits of data into the extracted bits */
        crc32 <<= 4; /* shift the CRC register left 4 bits */     
        crc32 ^= crc32_lookup[t]; /* do the table lookup and XOR the result */
    }
    
    return crc32;
}


/*********** Firmware File Functions + helpers ************/

/* test if the version number is consistent with the platform */
bool CheckPlatform(int platform_id, UINT16 version)
{
    if (version == 200)
    {   /* for my very first firmwares, I foolishly changed it to 200 */
        return (platform_id == ID_RECORDER || platform_id == ID_FM);
    }
    else if (version == 123)
    {   /* it can be a FM or V2 recorder */
        return (platform_id == ID_FM || platform_id == ID_REC_V2);
    }
    else if (version == 132)
    {   /* seen on a V2 recorder */
        return (platform_id == ID_REC_V2);
    }
    else if (version >= 115 && version <= 129)
    {   /* the range of Recorders seen so far */
        return (platform_id == ID_RECORDER);
    }
    else if (version == 0 || (version >= 300 && version <= 506))
    {   /* for very old players, I've seen zero */
        return (platform_id == ID_PLAYER);
    }

    return false; /* unknown */
}


tCheckResult CheckFirmwareFile(char* filename, int chipsize, bool is_romless)
{
    int i;
    int fd;
    int fileleft; /* size info, how many left for reading */
    int fileread = 0; /* total size as read from the file */
    int read_now; /* how many to read for this sector */
    int got_now; /* how many gotten for this sector */
    unsigned crc32 = 0xFFFFFFFF; /* CCITT init value */
    unsigned file_crc; /* CRC value read from file */
    bool has_crc;
    
    fd = rb->open(filename, O_RDONLY);
    if (fd < 0)
        return eFileNotFound;
    
    fileleft = rb->filesize(fd);
    if (fileleft > chipsize)
    {
        rb->close(fd);
        return eTooBig;
    }
    else if (fileleft < 50000) /* give it some reasonable lower limit */
    {
        rb->close(fd);
        return eTooSmall;
    }
    
    if (fileleft == 256*1024)
    {   // original dumped firmware file has no CRC nor platform ID
        has_crc = false;
    }
    else
    {
        has_crc = true;
        fileleft -= sizeof(unsigned); // exclude the last 4 bytes
    }

    /* do some sanity checks */
    
    got_now = rb->read(fd, sector, SEC_SIZE); /* read first sector */
    fileread += got_now;
    fileleft -= got_now;
    if (got_now != SEC_SIZE)
    {
        rb->close(fd);
        return eReadErr;
    }

    /* version number in file plausible with this hardware? */
    if (!CheckPlatform(PLATFORM_ID, *(UINT16*)(sector + VERSION_ADR)))
    {
        rb->close(fd);
        return eBadPlatform;
    }
    
    if (has_crc)
    {
        crc32 = crc_32(sector, SEC_SIZE, crc32); /* checksum */
        
        /* in addition to the CRC, my files also have a platform ID */
        if (sector[PLATFORM_ADR] != PLATFORM_ID) /* for our hardware? */
        {
            rb->close(fd);
            return eBadPlatform;
        }
    }

    if (is_romless)
    {   /* in this case, there is not much we can check */
        if (*(UINT32*)sector != 0x00000200) /* reset vector */
        {
            rb->close(fd);
            return eBadContent;
        }
    }
    else
    {
        /* compare some bytes which have to be identical */
        if (*(UINT32*)sector != 0x41524348) /* "ARCH" */
        {
            rb->close(fd);
            return eBadContent;
        }
    
        for (i = 0x30; i<MASK_ADR-1; i++) /* leave one byte for me */
        {
            if (sector[i] != FB[i])
            {
                rb->close(fd);
                return eBadContent;
            }
        }
    }
    
    /* check if we can read the whole file, and do checksum */
    do
    {
        read_now = MIN(SEC_SIZE, fileleft);
        got_now = rb->read(fd, sector, read_now);
        fileread += got_now;
        fileleft -= got_now;

        if (read_now != got_now)
        {
            rb->close(fd);
            return eReadErr;
        }

        if (has_crc)
        {
            crc32 = crc_32(sector, got_now, crc32); /* checksum */
        }
    } while (fileleft);

    if (has_crc)
    {
        got_now = rb->read(fd, &file_crc, sizeof(file_crc));
        if (got_now != sizeof(file_crc))
        {
            rb->close(fd);
            return eReadErr;
        }
    }
    
    /*  must be EOF now */
    got_now = rb->read(fd, sector, SEC_SIZE);
    rb->close(fd);
    if (got_now != 0)
        return eReadErr;

    if (has_crc && file_crc != crc32)
        return eCrcErr;
    
    return eOK;
}


/* returns the # of failures, 0 on success */
unsigned ProgramFirmwareFile(char* filename, int chipsize)
{
    int i, j;
    int fd;
    int read = SEC_SIZE; /* how many for this sector */
    UINT16 keep = *(UINT16*)(FB + KEEP); /* we must keep this! */
    unsigned failures = 0;
    
    fd = rb->open(filename, O_RDONLY);
    if (fd < 0)
        return false;
    
    for (i=0; i<chipsize; i+=SEC_SIZE)
    {
        if (!EraseSector(FB + i))
        {
            /* nothing we can do, let the programming count the errors */
        }
        
        if (read == SEC_SIZE) /* not EOF yet */
        {
            read = rb->read(fd, sector, SEC_SIZE);
            if (i==0)
            {   /* put original value back in */
                *(UINT16*)(sector + KEEP) = keep;
            }
            
            for (j=0; j<read; j++)
            {
                if (!ProgramByte(FB + i + j, sector[j]))
                {
                    failures++;
                }
            }
        }
    }
    
    rb->close(fd);
    
    return failures;
}


/* returns the # of failures, 0 on success */
unsigned VerifyFirmwareFile(char* filename)
{
    int i=0, j;
    int fd;
    int read = SEC_SIZE; /* how many for this sector */
    unsigned failures = 0;
    
    fd = rb->open(filename, O_RDONLY);
    if (fd < 0)
        return false;
    
    do
    {
        read = rb->read(fd, sector, SEC_SIZE);
        
        for (j=0; j<read; j++)
        {
             /* position of keep value is no error */
            if (FB[i] != sector[j] && i != KEEP && i != (KEEP+1))
            {
                failures++;
            }