Troubles with VIA VX900 chipset

[Alexandre Martins]

Dear,

We have seen some issues with the VIA VX900 chipset. The main trouble is that 
some SATA hard drive are not seen by the kernel (BIOS and boot-loader are OK).

After investigations, it seems that during the initialisation of the 
controler, some reset commands are send via "ata_via_sata_reset" fonction. 
Into the chipset documentation, there is a warning about successive reset 
commands, and software must waiting the "BUSY" flag is clear, before send 
another reset. I have added a "DELAY(10000)" between the second call of 
"ata_sata_phy_reset" and the call of "ata_generic_reset" and the problem 
disapear.

I also made a more complex fix which check the "BUSY" flag.

Which fix of delai checking is the better one ?

Best Regards

-- 
Alexandre Martins
NETASQ -- We secure IT

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