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bl efuse 操作 api

发表于 更新于 分类于 Valine： 
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/****************************************************************************/ /**
 * @brief  Efuse lock reading for aes key
 *
 * @param  index: index of key slot
 * @param  program: program to efuse entity or not
 *
 * @return None
 *
*******************************************************************************/
void EF_Ctrl_Readlock_AES_Key(uint8_t index, uint8_t program)
{
    uint32_t tmpVal;

    if (index > 5) {
        return;
    }

    /* Switch to AHB clock */
    EF_Ctrl_Sw_AHB_Clk_0();

    tmpVal = BL_RD_REG(EF_DATA_BASE, EF_DATA_0_LOCK);
    tmpVal |= (1 << (index + 26));
    BL_WR_REG(EF_DATA_BASE, EF_DATA_0_LOCK, tmpVal);

    if (program) {
        EF_Ctrl_Program_Efuse_0();
    }
}

/****************************************************************************/ /**
 * @brief  Efuse write AES key
 *
 * @param  index: index of key slot
 * @param  keyData: key data buffer
 * @param  len: key data length in words
 * @param  program: program to efuse entity or not
 *
 * @return None
 *
*******************************************************************************/
void EF_Ctrl_Write_AES_Key(uint8_t index, uint32_t *keyData, uint32_t len, uint8_t program)
{
    uint32_t *pAESKeyStart0 = (uint32_t *)(EF_DATA_BASE + 0x1C);

    if (index > 5) {
        return;
    }

    /* Switch to AHB clock */
    EF_Ctrl_Sw_AHB_Clk_0();

    /* Every key is 4 words len*/
    BL702_MemCpy4(pAESKeyStart0 + index * 4, keyData, len);

    if (program) {
        EF_Ctrl_Program_Efuse_0();
    }
}

代码示例:

假设key为

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uint32_t *keyData = {
    0x41cb3b9a,
    0x7cf9f7cf,
    0xdc0dd12f,
    0x6c3ed53a,
    0x00a0c824,
    0xc737923e,
    0xe2f055f1,
    0x34afa0f7,
}
// 写入key_slot2 key_slot3
EF_Ctrl_Write_AES_Key(2, keyData, 8, 1);

先做实验, 验证key_slot2, key_slot3 是否正常写入

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/****************************************************************************/ /**
 * @brief  Efuse read AES key from specified region and index
 *
 * @param  index: index of key slot
 * @param  keyData: key data buffer
 * @param  len: key data length in words
 *
 * @return None
 *
*******************************************************************************/
void EF_Ctrl_Read_AES_Key(uint8_t index, uint32_t *keyData, uint32_t len)
{
    uint32_t *pAESKeyStart0 = (uint32_t *)(EF_DATA_BASE + 0x1C);

    if (index > 5) {
        return;
    }

    /* Trigger read data from efuse*/
    EF_CTRL_LOAD_BEFORE_READ_R0;

    /* Every key is 4 words len*/
    BL702_MemCpy4(keyData, pAESKeyStart0 + index * 4, len);
}

示例代码, 读取key_slot2, key_slot3的key数据

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uint32_t keyRead[8] = {0};
EF_Ctrl_Read_AES_Key(2, keyRead, 8);

判断keyRead 与 keyData 是否一致

如果前面写入正常, 最后需要对key_slot2, key_slot3 做读保护

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// 写read lock, 读保护key_slot2
EF_Ctrl_Readlock_AES_Key(2, 1);
// 读保护key_slot3
EF_Ctrl_Readlock_AES_Key(3, 1);