?
?
?
?
?
When ? the ? Quick ? Start ? board ? was ? originally ? designed, ? several ? of ? the ? BOOT_CFG ? pins ? were ? selectable ? by ?
the ? 10 ? position ? DIP ? Switch ? (SW1). ? After ? initial ? testing ? of ? the ? Quick ? Start ? board, ? the ? optimum ? BOOT_CFG ?
settings ? for ? flexibility ? and ? ease ? of ? use ? were ? determined. ? These ? are ? the ? default ? settings ? on ? the ? board, ?
which ? set ? the ? microSD ? card ? connector ? (SD1) ? as ? the ? default ? boot ? source. ? As ? the ? developer ? becomes ? more ?
familiar ? with ? the ? board ? and ? wishes ? to ? experiment ? more, ? it ? is ? recommended ? that ? the ? next ? step ? for ? the ?
developer ? is ? to ? write ? code ? for ? the ? microSD ? card ? to ? initialize ? as ? alternative ? boot ? source ? and ? pass ? off ? the ?
boot ? process ? to ? the ? new ? source. ?
?
As ? further ? experience ? is ? gained, ? the ? developer ? may ? wish ? to ? install ? the ? optional ? DIP ? switch ? on ? SW1 ?
(Multicomp ? MCNHDS ‐ 10 ‐ T). ? The ? boot ‐ switch ? was ? originally ? removed ? to ? improve ? ease ? of ? use ? and ? ensure ?
all ? members ? of ? the ? community ? are ? developing ? the ? same ? way. ? Installing ? the ? boot ‐ switch ? will ? allow ? the ?
developer ? to ? gain ? access ? to ? selecting ? either ? SD ? card ? socket ? as ? the ? bootable ? source, ? or ? to ? select ? the ? serial ?
downloader ? method. ? Finally, ? for ? the ? skilled ? developers, ? it ? is ? possible ? to ? desolder ? and ? rearrange ? some ? of ?
the ? pull ‐ up ? and ? pull ‐ down ? resistors ? on ? the ? Quick ? Start ? board. ? Figures ? 16 ? and ? 17 ? highlight ? all ? of ? the ? pull ‐
up ? and ? pull ‐ down ? resistors ? used, ? and ? also ? highlights ? sources ? of ? either ? high ? (3.3V) ? or ? low ? (GND) ? logic ?
levels. ??
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
R48 ? R47
R46 ?
?
Figure ? 16. ?
Boot ? Mode ? Resistor ? Locations ? TOP ?
?
?
?
?
Resistor ?
R46 ?
R47 ?
R48 ?
Boot ? Configuration ? Bit ?
BOOT_CGF1[6] ?
BOOT_CGF1[7] ?
BOOT_CGF2[7] ?
Pull ? UP/Down ?
Pull ? Up ?
Pull ? Down ?
Pull ? Up ? (DNP) ?
?
Table ? 7. ? ??? Boot ? Mode ? Resistors ? TOP ?
Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
46
PUBI – Public Use Business Information ?
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