我们公司使用飞思卡尔imx6系列处理器已经2年多了，最近购买贵公司一批i.mx处理器发现点问题，现在简单描述下该问题。
之前我们一直用的是飞思卡尔MCIMX6Q6AVT10AC（芯片ID rev1.2）芯片的，我们用这个芯片做了一些开发板，上面接了个SATA硬盘测试一直都是没问题的，自从飞思卡尔官网上面买不到这种芯片（不知道是不是停产），而改用MCIMX6Q6AVT10AD（芯片ID rev1.5）后，将芯片焊接在原来的板子上面，sata接口就通讯不正常了，具体启动信息贴在下面：
正常的MCIMX6Q6AVT10AC（芯片ID rev1.2）启动信息如下：
U-Boot 2013.01 (Aug 11 2014 - 01:16:03)
CPU: Freescale i.MX6Q rev1.2 at 792 MHz
Reset cause: POR
Board: SABRE Lite
DRAM: 256 MiB
WARNING: Caches not enabled
MMC: FSL_SDHC: 0, FSL_SDHC: 1
SF: Detected SST25VF016B with page size 4 KiB, total 2 MiB
*** Warning - bad CRC, using default environment
No panel detected: default to HDMI
unsupported panel HDMI
In: serial
Out: serial
Err: serial
Thermal fuse is 0x5844e67d, raw_25c=1412 raw_hot=1254 hot_temp=125 C scale=0.63
Temperature raw=1391 temperature= 38.29 C
Net: Phy not found
using phy at 4
PHY reset timed out
FEC [PRIME]
Warning: failed to set MAC address
Hit any key to stop autoboot: 0
AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
flags: ncq stag pm led clo only pmp pio slum part
SATA Device Info:
S/N: 9QE0M77K
Product model number: ST3250820AS
Firmware version: 3.AAC
Capacity: 488397168 sectors
SATA device 0: Model: ST3250820AS Firm: 3.AAC Ser#: 9QE0M77K
Type: Hard Disk
Supports 48-bit addressing
Capacity: 238475.1 MB = 232.8 GB (488397168 x 512)
... is now current device
硬盘ID可以正常读取出来。
*******************************************************************************************************************
不正常MCIMX6Q6AVT10AD（芯片ID rev1.5）启动信息：
U-Boot 2013.01 (Aug 11 2014 - 01:16:03)
CPU: Freescale i.MX6Q rev1.5 at 792 MHz
Reset cause: POR
Board: SABRE Lite
DRAM: 256 MiB
WARNING: Caches not enabled
MMC: FSL_SDHC: 0, FSL_SDHC: 1
SF: Detected SST25VF016B with page size 4 KiB, total 2 MiB
*** Warning - bad CRC, using default environment
No panel detected: default to HDMI
unsupported panel HDMI
In: serial
Out: serial
Err: serial
Thermal fuse is 0x5714bc7d, raw_25c=1393 raw_hot=1212 hot_temp=125 C scale=0.55
Temperature raw=1396 temperature= 23.34 C
Net: Phy not found
using phy at 4
PHY reset timed out
FEC [PRIME]
Warning: failed to set MAC address
Hit any key to stop autoboot: 0
AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
flags: ncq stag pm led clo only pmp pio slum part
timeout exit!
timeout exit!
SATA Device Info:
S/N:
Product model number:
Firmware version: 5
Capacity: 0 sectors
SATA device 0: Model: Firm: Ser#:
Type: Hard Disk
Capacity: not available
... is now current device
** Bad device size - sata 0 **
** Bad device size - sata 0 **
硬盘ID读取出来都是空的。
已经焊接过几块板子了，可以排除是电路版焊接问题
用的都是同一块硬盘和线，也可以排除硬盘和线的问题。
另外，发现rev1.5版本也不是完全100%读不到硬盘ID的，就是有时候能正常读取出ID，试个几十次会有一两次能读取出ID的。
而旧版的rev1.2的是可以100%读到ID的。
