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Changes between Version 2 and Version 3 of UBoot


Ignore:
Timestamp:
2010-06-19T21:19:58Z (11 years ago)
Author:
Jiri Svoboda
Comment:

Legend:

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  • UBoot

    v2 v3  
    1717
    1818Qi does much less HW initialization than U-Boot so it may be necessary to add more HW initialization to HelenOS to support it. (E.g. turning on display backlight).
     19
     20== Machine state on image entry ==
     21
     22The uImage can specify:
     23 * address at which it should be loaded
     24 * address of the entry point
     25
     26U-Boot transfers control to the entry point. Upon this transfer CPSR![7:0] = 0xd3 = 0b 1101 0111. In other words:
     27
     28|| Field || Value   || Meaning ||
     29|| I     ||   1     || IRQ interrupts are disabled ||
     30|| F     ||   1     || FIQ interrupts are disabled ||
     31|| T     ||   0     || ARM execution (not Thumb) ||
     32|| M     || 0b10111 || Processor is in ''Abort'' mode?! ||