?
?
?
?
?
?
BOOT_ ?
CFG3[7] ?
BOOT_ ?
CFG3[6] ?
BOOT_ ?
CFG3[5] ?
BOOT_ ?
CFG3[4] ?
BOOT_ ?
CFG3[3] ?
BOOT_ ?
CFG3[2] ?
BOOT_ ?
CFG3[1] ?
BOOT_ ?
CFG3[0] ?
PIN ?
EIM_DA4 ? EIM_DA5 ? EIM_DA6 ? EIM_DA7 ? EIM_DA8 ? EIM_DA9 ? EIM_DA10 ? N/A ?
Default ?
0 ?
0 ?
0 ?
0 ?
0 ?
0 ?
0 ? ‐?
?
Table ? 6C. ?
BOOT_CFG ? Word3 ?
?
Of ? these ? 21 ? pins, ? four ? of ? them ? have ? the ? same ? meaning ? regardless ? of ? the ? selected ? boot ? source. ? These ?
four ? BOOT_CFG ? bits ? with ? their ? meanings ? are ? as ? follows: ?
?
BOOT_CFG1[1] ? Processor ? Speed ? setting ? during ? boot: ?
? ?
? ?
0 ? – ? 800 ? MHz ?
1 ? – ? 400 ? MHz ?
?
BOOT_CFG1[0] ? MMU ? Enabled ? during ? boot: ?
? ?
? ?
0 ? – ? MMU ? not ? enabled ?
1 ? – ? Initializing ? MMU ? with ? L1 ? Cache ? during ? boot ?
?
BOOT_CFG2[3] ? AXI/DDR ? Speed ? setting ? during ? boot: ?
? ?
? ?
0 ? – ? PLL2: ? 400MHz ?
1 ? – ? PLL2: ? 333MHz ?
?
BOOT_CFG2[2] ? Oscillator ? Frequency ? Select: ?
? ?
? ?
0 ? – ? Auto ? Detect ?
1 ? – ? Set ? to ? 24MHz ?
?
The ? six ? pins ? that ? determine ? where ? bootable ? code ? is ? stored ? are ? BOOT_CFG1[7:2]. ? Depending ? on ? which ?
boot ? source ? is ? selected, ? some ? of ? these ? pins ? may ? have ? different ? meanings. ? Those ? pins ? will ? show ? up ? as ? an ?
‘X’ ? for ? logic ? level. ? The ? specific ? logic ? levels ? and ? their ? meanings ? are ? as ? follows: ?
?
BOOT_CFG1[7:2] ?
Boot ? Code ? Source ? Selection ?
?
0000 ? ‐?? NOR/OneNAND ? Boot ?
0001 ? ‐?? Reserved ?
0010 ? ‐?? PATA/SATA ? Boot ?
0011 ? ‐?? Serial ? ROM ? (I2C/SPI) ? Boot ?
01XX ? ‐?? SD/MMC ? (eSD/eMMC) ? Boot ?
1XXX ? ‐?? NAND ? Flash ? Boot ?
?
For ? each ? of ? the ? bootable ? source ? selections, ? the ? remaining ? BOOT_CFG ? pins ? have ? different ? meanings. ? The ?
pins ? are ? meant ? to ? choose ? initialization ? settings ? required ? for ? each ? specific ? boot ? source. ? The ? following ?
paragraphs ? will ? specify ? those ? choices ? base ? by ? bootable ? source: ?
?
? ?
Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
42
PUBI – Public Use Business Information ?
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