On Tue, Jan 14, 2025 at 11:10:26AM -0500, Christopher Lentocha wrote:
> 
> For whatever reason, when you compile SeaBIOS in Csm16 mode, and use it
> under EDK2's OvmfPkg, the ATA_CMD_IDENTIFY_PACKET_DEVICE command
> doesn't work properly,

Probably the device is in a different state due to the edk2 driver
having talked to the device before.

Maybe add a controller reset to the initialization path?  Currently
the driver code only resets the ports.

> In order to fix this bug, I decided to move the "detected as a disk"
> function to be a goto, so code isn't sloppy, by being copied and
> pasted 1:1 (though this can be changed back later if needed), and in
> the detected as CDROM function, when it fails at its point, assume its
> a harddisk, make sure it is with the ATA_CMD_IDENTIFY_DEVICE (which
> works fine in my testing) command, and continue from there.

That is more a workaround than a solution ...

take care,
  Gerd

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