tree 4376eca3a3e084f9dec6bb224b958393dab8be05
parent a1b1d7eceb033c256ae661d65732323809fb9101
author Thomas Chou <thomas@wytron.com.tw> 1450838032 +0800
committer Thomas Chou <thomas@wytron.com.tw> 1451266363 +0800

altera_qspi: skip erase if the sector is blank

Skip erase if the sector is blank. The sector erase is slow, and
may take 0.7 sec typically or up to 3 sec worst-case.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>