On 2019/5/5 23:37, Peter Maydell wrote: > On Sun, 5 May 2019 at 08:02, Xiang Zheng <zhengxia...@huawei.com> wrote: >> >> Currently we fill the memory space with two 64MB NOR images when >> using persistent UEFI variables on virt board. Actually we only use >> a very small(non-zero) part of the memory while the rest significant >> large(zero) part of memory is wasted. >> >> So this patch checks the block status and only writes the non-zero part >> into memory. This requires pflash devices to use sparse files for >> backends. > > Do you mean "pflash devices will no longer work if the file > that is backing them is not sparse", or just "if the file that > is backing them is not sparse then you won't get the benefit > of using less memory" ? >
I mean the latter, if the file is not sparse, nothing would change. I will improve this commit message in the next version. -- Thanks, Xiang
