i.MX ProcessorsのトピックI.MX6 SATA problem

I.MX6 SATA problem

sunfrank — Sat, 04 Feb 2017 09:22:36 GMT

Hi, community

I meet a problem of SATA

hardware : Imx6q core board + carrier

OS : LINUX 3.0.35

SATA device : I tried both HDD and SSD

when power on we can see this information from serial port:

....

Uniform Multi-Platform E-IDE driver
ide-gd driver 1.18
ahci: SSS flag set, parallel bus scan disabled
ahci ahci.0: AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl platform mode
ahci ahci.0: flags: ncq sntf stag pm led clo only pmp pio slum part ccc apst
scsi0 : ahci_platform
ata1: SATA max UDMA/133 mmio [mem 0x02200000-0x02200fff] port 0x100 irq 71
GPMI NAND driver registered. (IMX)

.....

and later:

ata1: SATA link down (SStatus 0 SControl 300)

I use external power for HDD, so power is stable.

Re: I.MX6 SATA problem

igorpadykov — Sun, 05 Feb 2017 23:46:13 GMT

Hi Sun

in general for better signal shape one can try to tweak IOMUX GPR13 register.
IOMUX GPR13 defines various SATA Phy transmitter/receiver settings.

Is it working in uboot, if yes then one can try to change configurations for IOMUXC_GPR13 to be same
in kernel as in U-boot (helped some customers).

diff --git a/arch/arm/mach-mx6/board-mx6q_sabresd.c b/arch/arm/mach-mx6/board-m

index ac9b8f8..95e5f2a 100644
--- a/arch/arm/mach-mx6/board-mx6q_sabresd.c
+++ b/arch/arm/mach-mx6/board-mx6q_sabresd.c
@@ -1177,7 +1177,7 @@ static int mx6q_sabresd_sata_init(struct device *dev, voi
         *.tx_edgerate_0(iomuxc_gpr13[0]),
         */
        tmpdata = readl(IOMUXC_GPR13);
-       writel(((tmpdata & ~0x07FFFFFD) | 0x0593A044), IOMUXC_GPR13);
+       writel(((tmpdata & ~0x07FFFFFD) | 0x0593E4C4), IOMUXC_GPR13);

Best regards
igor
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Re: I.MX6 SATA problem

sunfrank — Tue, 07 Feb 2017 05:55:16 GMT

Hi,

thank you very much for your reply. my kernal can detect the HDD now,renson is the .config, lack of SATA support. but the new problem is in android 4.4 , still can not detect the HDD, I found a document which says can modify the vold.fstab in ../system/etc,to set the HDD as a SD card. but it seems like vold.fstab is not exsist any more after android 4.4...do you know another way to let android support the sata disk?