June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Phase 2 – secondary program loader
The SPL must set up the memory controller and other essential parts of the system preparatory to loading the Tertiary Program Loader (TPL) into DRAM. The functionality of the SPL is limited by the size of the SRAM. It can read a program from a list of storage devices, as can the ROM code, once again using pre-programmed offsets from the start of a flash device. If the SPL has file system drivers built in, it can read well known file names, such as u-boot.img, from a disk partition. The SPL usually doesn't allow for any user interaction, but it may print version information and progress messages, which you can see on the console. The following diagram explains the phase 2 architecture:
The SPL may be open ...
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