Hi, Since updating my cubietruck to u-boot-2014.10 the SATA hard drive connected to it performs emergency head parking around the time uboot hands over control to kernel (or kernel is booting).
The same issue also exists during reboot. Looking at the changes in u-boot-2014.10 SATA support has been added. It looks like u-boot is setting up SATA then kernel is doing the same, killing SATA power while reconfiguring the AHCI or SATApower GPIO. Could u-boot put SATA drive into standby (or at least ask it to sync and park its heads) prior to handing control over to kernel? On the other hand it would be nice if SATApower could be preserved along the different steps of boot process. On kernel side I'm using the following patch to protect the SATA drive during reboot: Author: Bruno Prémont <[email protected]> Date: Wed Jul 9 22:50:43 2014 +0200 sd: Stop disks on reboot Some systems (e.g. Acer Travelmate 66x laptop, Cubietruck) to power-reset on reboot and thus make disks age more quickly due to emergency head parking & stop. Do not prevent stopping disk on reboot even if it might slow down following boot process. --- drivers/scsi/sd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 2c2041c..e5ff75f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3158,7 +3158,7 @@ static void sd_shutdown(struct device *dev) sd_sync_cache(sdkp); } - if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { + if (sdkp->device->manage_start_stop) { sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); sd_start_stop_device(sdkp, 0); }
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