Re: IDE-flash device and hard disk on same controller

From: Jeff Garzik (
Date: Fri Aug 23 2002 - 21:02:44 EST

Benjamin Herrenschmidt wrote:
> Well... x86 PCs with ordinary BIOSes did. Other firmwares,
> embedded devices, whatever.... may not, or eventually the firmware
> will have reset everything prior to booting the kernel (go figure
> why, but that happens).
> It's not difficult nor harmful to wait for that dawn busy bit to
> go away, so why not do it ?

Basically think about the consequences of trying to handle a completely
unknown state -- if you are going to attempt to handle this you would
need to check for data, not just the BSY bit. And read the data into a
throwaway buffer, if there is data to be read, or write the data it's

So it's not just the busy bit :)

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This archive was generated by hypermail 2b29 : Fri Aug 23 2002 - 22:00:29 EST