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Hardware Reference Manual for i.MX53 Quick Start
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5.4.2. Boot Mode Operations and Selections
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The ? i.MX53 ? Applications ? Processor ? can ? be ? directed ? to ? boot ? from ? the ? logic ? levels ? on ? 24 ? different ? pins ?
designated ? for ? boot ? mode ? configurations, ? or ? it ? can ? be ? directed ? to ? boot ? from ? internal ? eFUSE ? settings, ? or ? it ?
can ? be ? directed ? to ? boot ? from ? a ? serial ? downloader ? (USB/UART). ? The ? method ? used ? to ? determine ? where ?
the ? Processor ? finds ? its ? boot ? information ? is ? from ? two ? dedicated ? BOOT_MODE ? pins. ? Table ? 5 ? shows ? the ?
values ? used ? of ? each ? of ? these ? methods. ?
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It ? is ? important ? for ? the ? developer ? to ? remember ? that ? these ? two ? pins ? are ? tied ? to ? the ? NVCC_RESET ? modules, ?
and ? therefore, ? on ? the ? Quick ? Start ? board, ? use ? a ? 1.8V ? logic ? level ? (unlike ? the ? Boot ? Configuration ? pins ? which ?
use ? a ? 3.3V ? logic ? level). ? The ? default ? boot ? selection ? for ? the ? Quick ? Start ? board ? is ? 00 ? – ? Boot ? from ? hardware ?
settings. ? Since ? it ? is ? not ? expected ? that ? developers ? will ? want ? to ? burn ? eFUSES ? on ? the ? Quick ? Start ? board, ? the ?
two ? BOOT_MODE ? pins ? are ? tied ? together ? through ? one ? switch ? position ? of ? the ? optional ? DIP ? Switch ? (SW1). ? If ?
the ? developer ? wishes ? to ? populate ? SW1, ? the ? position ? 10 ? switch ? can ? be ? moved ? to ? ON ? so ? that ? the ?
BOOT_MODE ? pins ? are ? both ? pulled ? high. ? Then ? the ? developer ? will ? be ? able ? to ? use ? the ? serial ? downloader ?
method ? of ? loading ? bootable ? code ? into ? the ? Processor. ?
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BOOT_MODE1 ?
0 ?
0 ?
1 ?
1 ?
BOOT_MODE0 ?
0 ?
1 ?
0 ?
1 ?
Boot ? Source ?
Determined ? By ? Board ? Hardware ?
Reserved ?
Determined ? By ? eFUSE ? Settings ?
Use ? Serial ? Downloader ?
Table ? 5. ?
BOOT_MODE ? pin ? Settings ?
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If ? the ? method ? of ? determining ? the ? bootable ? source ? code ? is ? selected ? to ? be ? from ? hardware, ? then ? 21 ? i.MX53 ?
pins ? are ? sampled ? at ? the ? beginning ? of ? the ? boot ? process. ? These ? 21 ? pins ? are ? shown ? in ? Tables ? 6A ? – ? 6C ? along ?
with ? their ? default ? setting ? on ? the ? Quick ? Start ? Board. ? Note ? that ? three ? bits ? in ? the ? BOO_CFG ? words ? do ? not ?
have ? corresponding ? pins ? to ? read. ?
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BOOT_ ?
CFG1[7] ?
BOOT_ ?
CFG1[6] ?
BOOT_ ?
CFG1[5] ?
BOOT_ ?
CFG1[4] ?
BOOT_ ?
CFG1[3] ?
BOOT_ ?
CFG1[2] ?
BOOT_ ?
CFG1[1] ?
BOOT_ ?
CFG1[0] ?
PIN ?
EIM_A22 ? EIM_A21 ? EIM_A20 ? EIM_A19 ? EIM_A18 ? EIM_A17 ? EIM_A16 ? EIM_LBA ?
Default ?
0 ?
1 ?
0 ?
0 ?
0 ?
0 ?
0 ?
1 ?
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Table ? 6A. ?
BOOT_CFG ? Word1 ?
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BOOT_ ?
CFG2[7] ?
BOOT_ ?
CFG2[6] ?
BOOT_ ?
CFG2[5] ?
BOOT_ ?
CFG2[4] ?
BOOT_ ?
CFG2[3] ?
BOOT_ ?
CFG2[2] ?
BOOT_ ?
CFG2[1] ?
BOOT_ ?
CFG2[0] ?
PIN ?
EIM_EB0 ? EIM_EB1 ? EIM_DA0 ? EIM_DA1 ? EIM_DA2 ? EIM_DA3 ? N/A ?
N/A ?
Default ?
0 ?
0 ?
1 ?
1 ?
1 ?
0 ? ‐? ‐?
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Freescale Semiconductor
Table ? 6B. ?
BOOT_CFG ? Word2 ?
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
41
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