clearfog: Document the SPI NOR flash weirdness
Basically, as long as the EV board is connected (via our custom
breadboard adapter), I just cannot get the SPI NOR flash to talk. The
kernel always says:
m25p80 spi1.0: unrecognized JEDEC id bytes: ff, ff, ff
Change-Id: Id58fbc9d98a04b77cf8f2f64b5ee71b62dd3c12e
diff --git a/board/czechlight/clearfog/czechlight-clearfog.dts b/board/czechlight/clearfog/czechlight-clearfog.dts
index 3095880..ef1bdb9 100644
--- a/board/czechlight/clearfog/czechlight-clearfog.dts
+++ b/board/czechlight/clearfog/czechlight-clearfog.dts
@@ -2,6 +2,10 @@
&w25q32 {
status = "okay";
+ /* The chip itself is rated up to 50MHz for regular reads, 60MHz for
+ * all other transactions, but somehow the mere presence of the
+ * MAX14830 EV board breaks these transfers. Changing the speed all the
+ * way down to 100kHz doesn't help. */
};
/ {