mtd: nand: do not write empty pages

Do not write pages which only contain 0xff. UBI expects pages which
seem empty to be writable. This got lost with:

| commit 3139c3e9a61e70846be8c4f95bb9cffd4465d88a
| Author: Sascha Hauer <s.hauer@pengutronix.de>
| Date:   Thu Nov 29 11:16:40 2012 +0100
|
|    mtd core: call driver write function with complete buffer
|
|    mtd->write is supposed to loop around pages internally, no need
|    to do this in mtd_write. This fixes a huge write performance drop
|    with the m25p80 driver when it was converted to a mtd driver recently.
|    Since mtd->writesize is 1 for this driver mtd_write ended up doing
|    single byte writes on the flash.

Introduce mtd_all_ff as a global function since UBI currently has its own
implementation.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
ubiformat: open flash image readonly

ubiformat only needs readonly access to the image to flash, so
open it readonly. Opening r/w may fail for example on tftp servers.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
fix compiler warnings: use puts() instead of printf()

Use puts() because printf() isn't necessary,
to fix the following compiler warnings:

/barebox/common/menu.c: In function ‘menu_show’:
/barebox/common/menu.c:277:4: warning: format not a string literal and no format arguments [-Wformat-security]

/barebox/scripts/omap4_usbboot.c: In function ‘read_asic_id’:
/barebox/scripts/omap4_usbboot.c:101:3: warning: format not a string literal and no format arguments [-Wformat-security]

Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: Vicente <vicencb@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
net: imx_fec: fix RMII support for i.MX6

Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
defaultenv-2: fix base/init/ps1: don't reload /env/config

Remove the load of /env/config because is already done by /bin/init,
so it doesn't overwrite any changes done by previous /init/* scripts that
are loaded by /bin/init.

Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
imx_spi: fix bus-num setup

Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>