Vxworks6.9下的SATA提速

从vxworks6.6转到vxworks6.9,发现硬盘读写很慢。多方查找资料做了如下提速设置。效果很好。

1.       ATA接口的三种数据传输方式

(1)PIO(Programmable Input-Output)传输,可以分为PIO寄存器传输和PIO数据传输。PIO寄存器传输主要用于对ATA设备中的寄存器进行读写。读写的数据位数为8位DD[7:0]。ATA主机控制器根据所要读写的寄存器地址设置CS0_、CS1_、DA[2:0]地址信号,同时将DIOW_或DIOR_设为有效,ATA主机控制器或ATA设备驱动数据总线释放数据。当DIOW_或DIOR_撤销时,ATA主机控制器或ATA设备从数据总线上读取数据。对于PIO数据传输,所读写的地址为数据端口,读写数据为16位。

(2)MDMA(Multiword DMA)传输,用于数据传输。ATA主机控制器向ATA设备下达MDMA传输命令后,等待设备向主机发送DMARQ数据传输请求信号。当主机收到DMARQ信号后,向设备发送DMACK_响应信号。MDMA数据传输过程与PIO方式大致相同,也是通过DIOW_或DIOR_的周期变化来控制数据的传输。在数据传输过程中,DMARQ和DMACK_握手信号一直保持有效。

(3)UDMA(Ultra DMA),也是用于数据传输。这种传输方式的传输速度比MDMA要快,ATA/ATAPI-5协议中所定义的UDMA传输方式最高数据传输速率是66MB/s。UDMA对数据传输的控制信号重新进行了定义。另外,UDMA还引入了CRC数据校验机制,保证了数据传输过程的正确性,但其传输过程较为复杂。

Transfer mode       | Description                   |  Transfer Rate

ATA_PIO_DEF_0       | PIO default mode              |

ATA_PIO_DEF_1       | PIO default mode, no IORDY    |

ATA_PIO_0           | PIO mode 0                    |     3.3 MBps

ATA_PIO_1           | PIO mode 1                    |     5.2 MBps

ATA_PIO_2           | PIO mode 2                    |     8.3 MBps

ATA_PIO_3           | PIO mode 3                    |    11.1 MBps

ATA_PIO_4           | PIO mode 4                    |    16.6 MBps

ATA_PIO_AUTO        | PIO max supported mode        |

ATA_DMA_SINGLE_0    | Single DMA mode 0             |     2.1 MBps

ATA_DMA_SINGLE_1    | Single DMA mode 1             |     4.2 MBps

ATA_DMA_SINGLE_2    | Single DMA mode 2             |     8.3 MBps

ATA_DMA_MULTI_0     | Multi word DMA mode 0         |     4.2 MBps

ATA_DMA_MULTI_1     | Multi word DMA mode 1         |    13.3 MBps

ATA_DMA_MULTI_2     | Multi word DMA mode 2         |    16.6 MBps

ATA_DMA_ULTRA_0     | Ultra DMA mode 0              |    16.6 MBps

ATA_DMA_ULTRA_1     | Ultra DMA mode 1              |    25.0 MBps

ATA_DMA_ULTRA_2     | Ultra DMA mode 2              |    33.3 MBps

ATA_DMA_ULTRA_3     | Ultra DMA mode 3              |    44.4 MBps

ATA_DMA_ULTRA_4     | Ultra DMA mode 4              |    66.6 MBps

ATA_DMA_ULTRA_5     | Ultra DMA mode 5              |   100.0 MBps

ATA_DMA_AUTO        | DMA max supported mode        |

配置:

NCLUDE_DRV_STORAGE_INTEL_ICH

INCLUDE_ATA

INCLUDE_PIIX4_ATADMA

INCLUDE_ICH7_SUPPORT

2.       Vxworks下SATA部分的启动流程

//usrConfig.c

#ifdef  INCLUDE_ATA

    usrAtaInit ();

    if (strcmp (FS_NAMES_ATA_PRIMARY_MASTER, "" ))

        usrAtaConfig (0, 0, FS_NAMES_ATA_PRIMARY_MASTER);

    if (strcmp (FS_NAMES_ATA_PRIMARY_SLAVE, "" ))

        usrAtaConfig (0, 1, FS_NAMES_ATA_PRIMARY_SLAVE);

    if (strcmp (FS_NAMES_ATA_SECONDARY_MASTER, "" ))

        usrAtaConfig (1, 0, FS_NAMES_ATA_SECONDARY_MASTER);

    if (strcmp (FS_NAMES_ATA_SECONDARY_SLAVE, "" ))

        usrAtaConfig (1, 1, FS_NAMES_ATA_SECONDARY_SLAVE);

#ifdef  INCLUDE_SHOW_ROUTINES

    ataShowInit ();                     /* install ATA/IDE show routine */

#endif  /* INCLUDE_SHOW_ROUTINES */

#endif  /* INCLUDE_ATA */

//usrAta.c

void usrAtaInit (void)

    {

    int ix;

    ATA_RESOURCE *pAtaResource;

    for (ix = 0; ix < ATA_MAX_CTRLS; ix++)

        {

        pAtaResource = &ataResources[ix];

        if (pAtaResource->ctrlType == IDE_LOCAL)

            if ((ataDrv (ix, pAtaResource->drives, pAtaResource->intVector,

                   pAtaResource->intLevel, pAtaResource->configType,

                   pAtaResource->semTimeout, pAtaResource->wdgTimeout))

               == ERROR)

                {

                printf ("ataDrv returned ERROR from usrRoot.\n");

                }

        }

}

//ataDrv.c

ataDrv - Initialize the ATA driver ……

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转载自blog.csdn.net/harhy/article/details/108596892
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