Dear Fabio Estevam,
On Fri, May 3, 2013 at 4:52 PM, Marek Vasut marex@denx.de wrote:
To boot a MX28 based board from SD, set the boot mode DIP switches
according -to i.MX28 manual chapter 12.2.1 (Table 12-2), PORT=SSP0, SD/MMC master on -SSP0, 3.3V.
+to i.MX28 manual chapter 12.2.1 (Table 12-2).
Make sure to leave the 3V3 thing there. PORT=SSPn would be a better solution here too.
Sorry, but I disagree.
Please check table 12-2 from mx28 reference manual and you will see that SD boot is also possible in 1.8V, so in the common README file it makes no sense to hardcode the boot voltage. Besides that, mx23 does not refer to 3.3V in its boot mode table.
When was the last time you saw 1V8 SD card ? ;-)
PORT=SSPn is also noisy. Let's get rid of all this. People will have to look the reference manual anyway.
Also, in v2 I will change "set the boot mode DIP switches" to "set the boot mode pins", as not all boards use DIP switches.
Best regards, Marek Vasut