mirror of https://github.com/acidanthera/audk.git
25589c4a76
Currently, when dealing with small updates that can be written out directly (i.e., if they only involve clearing bits and not setting bits, as the latter requires a block level erase), we iterate over the data one word at a time, read the old value, compare it, write the new value, and repeat, unless we encountered a value that we cannot write (0->1 transition), in which case we fall back to a block level operation. This is inefficient for two reasons: - reading and writing a word at a time involves switching between array and programming mode for every word of data, which is disproportionately costly when running under KVM; - we end up writing some data twice, as we may not notice that a block erase is needed until after some data has been written to flash. So replace this sequence with a single read of up to twice the buffered write maximum size, followed by one or two buffered writes if the data can be written directly. Otherwise, fall back to the existing block level sequence, but without writing out part of the data twice. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Sunil V L <sunilvl@ventanamicro.com> |
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| VirtNorFlash.c | ||
| VirtNorFlash.h | ||
| VirtNorFlashDxe.c | ||
| VirtNorFlashDxe.inf | ||
| VirtNorFlashFvb.c | ||