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Hardware Reference Manual for i.MX53 Quick Start
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In ? order ? to ? use ? the ? optional ? LCD ? daughter ? card ? with ? the ? Quick ? Start ? board, ? the ? environmental ? variables ?
must ? be ? correctly ? set ? to ? support ? the ? card. ? This ? change ? needs ? to ? be ? done ? only ? one ? time, ? when ? the ? LCD ?
Display ? card ? is ? first ? used. ? The ? change ? requires ? the ? developer ? to ? use ? a ? host ? computer ? running ? a ? terminal ?
window. ? When ? the ? power ? button ? is ? first ? pressed, ? the ? developer ? has ? 3 ? seconds ? to ? defeat ? the ? AUTOBOOT ?
feature ? by ? pressing ? any ? key ? on ? the ? host ? computer. ? Once ? the ? boot ? cycle ? has ? been ? stopped, ? the ? developer ?
now ? has ? access ? to ? change ? the ? boot ? environmental ? variables ? on ? the ? software ? image. ? At ? the ? terminal ?
window, ? the ? developer ? should ? type ? the ? following ? two ? lines, ? pressing ? the ? enter ? key ? after ? each ? line: ?
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setenv ? bootargs_base ? ‘set ? bootargs ? console=ttymxc0,115200 ? ${lcd}’ ?
saveenv ?
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Once ? the ? change ? is ? saved ? ( saveenv ), ? the ? Quick ? Start ? board ? can ? be ? turned ? off ? and ? then ? back ? on, ? or ? the ?
developer ? can ? type ? boot ? on ? the ? terminal ? to ? restart ? the ? boot ? process. ? The ? Quick ? Start ? board ? is ? now ?
correctly ? configured ? for ? LCD ? operation. ? A ? note ? for ? developers: ? The ? LCD ? parameters ? are ? contained ? in ? the ?
U ‐ BOOT ? code, ? and ? the ? recommended ? line ? to ? change ? the ? video ? output ? parameters ? only ? tells ? U ‐ BOOT ? to ?
substitute ? the ? stored ? parameters ? into ? the ? boot ? process. ? If ? the ? developer ? wishes ? to ? enter ? the ? exact ? string ?
of ? variables ? into ? the ? U ‐ BOOT ? code, ? the ? following ? line ? can ? be ? used ? instead ? of ? the ? first ? line ? above: ?
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setenv bootargs_base ‘set bootargs console=ttymxc0,115200
video=mxcdi0fb:RGB24,SEIKO-WVGA
The above entry is all one line. After the line entry is made, the saveenv entry is also needed.
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Freescale Semiconductor
Hardware User Guide for i.MX53 Quick Start Board,
Preliminary Rev 0.91
83
PUBI – Public Use Business Information ?
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