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Zyxel NAS326 HDD booting issue

Posted by bodhi 
Zyxel NAS326 HDD booting issue
August 20, 2019 05:46PM
Zyxel NAS326 HDD booting issue


Note: you don't have to worry about this issue if you are booting with USB rootfs.

Here is what I found from reading the GPL source to trouble shoot the issue of booting the NAS326 with 2 HDDs, with the rootfs is on one HDD.

NAS326 stock u-boot uses an old AHCI driver. This old version set the link detection timeou to a very small value of 4 ms. This interval is apparently too small. In the latest version of this AHCI driver, it is set to 200 ms.

Since I have not started building new u-boot (because of UART booting issue with this box), we cannot update this u-boot, or replace it with a better one.

So at the moment, we can only work around it.

I will do some testing to see if we can pick a good work around to enable the SATA link up before we try to initialize the SATA port for booting the kernel on HDD.

Update:

- Here is a work around that seems to do the trick consistently for me and heiko: Whenever the box needs to be rebooted, just shutdown and power up again. Then both HDDs will be initialized OK.

-bodhi
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