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Some links on some PMPs locks up on SRST and/or report incorrect device signature. Implement ATA_LFLAG_NO_SRST, ASSUME_ATA and ASSUME_SEMB to handle these quirky links. NO_SRST makes EH avoid SRST. ASSUME_ATA and SEMB forces class code to ATA and SEMB_UNSUP respectively. Note that SEMB isn't currently supported yet so the _UNSUP variant is used. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>