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authorRonald Hoogenboom <hoogenboom30@zonnet.nl>2008-01-21 23:55:08 +0000
committerCarl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>2008-01-21 23:55:08 +0000
commit21efd9ffe2bc51463bd4278def63e3c294907da2 (patch)
treef2ff7373c67075ec0375ce942959ba33f9bc0be6 /util
parent679c62c083d4e4edbc292160d441dbfe6ae3cd40 (diff)
downloadcoreboot-21efd9ffe2bc51463bd4278def63e3c294907da2.tar.xz
Omitting the wait for SPI ready when there is no data to be read, e.g.
readcnt==0 saves 10 seconds with the unconditional 10us delay, reducing programming time for SST25VF016B to 40-45 secs. Signed-off-by: Ronald Hoogenboom <hoogenboom30@zonnet.nl> Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3068 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'util')
-rw-r--r--util/flashrom/spi.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/util/flashrom/spi.c b/util/flashrom/spi.c
index 20e8828697..4c01b3104f 100644
--- a/util/flashrom/spi.c
+++ b/util/flashrom/spi.c
@@ -227,12 +227,15 @@ static int it8716f_spi_command(uint16_t port, unsigned int writecnt, unsigned in
* We can't use writecnt directly, but have to use a strange encoding.
*/
outb(((0x4 + (fast_spi ? 1 : 0)) << 4) | ((readcnt & 0x3) << 2) | (writeenc), port);
- do {
- busy = inb(port) & 0x80;
- } while (busy);
- for (i = 0; i < readcnt; i++) {
- readarr[i] = inb(port + 5 + i);
+ if (readcnt > 0) {
+ do {
+ busy = inb(port) & 0x80;
+ } while (busy);
+
+ for (i = 0; i < readcnt; i++) {
+ readarr[i] = inb(port + 5 + i);
+ }
}
return 0;