Uclinux-2008r1-rc8 (bf561) to VDSP5 Transplantation (39): Link rearrangement

In the previous implementation, there is no manual SDRAM segmentation, when the kernel Hour has not found the problem, but when the kernel is getting larger, it began to appear problems. The main performance is VDSP5 in the link, will automatically some relatively small variables or code snippets into the space, even in the Output_section plus force_contiguity also have no effect.

Like what

___per_cpu_start = .;
INPUT_SECTIONS($LIBRARIES_UCLINUX(.data.percpu))
___per_cpu_end = .;

Finally found that. The contents of DATA.PERCPU were moved to other corners, while __per_cpu_start and __per_cpu_end all pointed to the same place, which inevitably caused the kernel to fail.

To solve this problem, the SDRAM is segmented by hand directly in the LDF file:

MEM_SDRAM_TEXT　　　　　　　　　 { TYPE(RAM) START(0x00004000) END(0x00013fff) WIDTH(8) }
MEM_SDRAM_RODATA　　　　　　　 { TYPE(RAM) START(0x00014000) END(0x00023fff) WIDTH(8) }
MEM_SDRAM_DATA　　　　　　　　　 { TYPE(RAM) START(0x00034000) END(0x00043fff) WIDTH(8) }
MEM_SDRAM_INIT_TEXT　　　　 { TYPE(RAM) START(0x00044000) END(0x00053fff) WIDTH(8) }
MEM_SDRAM_INIT_PERCPU　　 { TYPE(RAM) START(0x00054000) END(0x00063fff) WIDTH(8) }
MEM_SDRAM　　　　　　　　　　　　　　 { TYPE(RAM) START(0x00064000) END(0x03ffffff) WIDTH(8) }

Then put the code or data of these segments into the appropriate memory space.

When the kernel increases, manually adjust the memory range above.