I am trying to understand the memory layout of the PRU. I am following the
instructions of Derek Molley's book "Exploring the BB" and he uses the
following linker command file
(https://github.com/derekmolloy/exploringBB/blob/master/chp13/prussC/AM3359_PRU.cmd):
-cr
-stack 0x100
-heap 0x100
MEMORY
{
PAGE 0:
PRUIMEM: o = 0x00000000 l = 0x00001000 /* 8kB PRU0 Instruction RAM */
PAGE 1:
PRUDMEM: o = 0x00000000 l = 0x00001000 /* 8kB PRU Data RAM 0 */
}
SECTIONS
{
/* Thanks to Jakub for the next line! */
.text:_c_int00* > 0x0, PAGE 0
.stack > PRUDMEM, PAGE 1
.bss > PRUDMEM, PAGE 1
.cio > PRUDMEM, PAGE 1
.const > PRUDMEM, PAGE 1
.data > PRUDMEM, PAGE 1
.switch > PRUDMEM, PAGE 1
.sysmem > PRUDMEM, PAGE 1
.cinit > PRUDMEM, PAGE 1
}
Is there a good way to reserve a portion of the data ram so I can safely
write from my host application with the pruss driver into it? It seems like
that I can for example write to address 0x0 on page 1 from linux and
retrieve the value, but at some point I interfere with other memory,
ostensibly the stack.
What's the best way to handle this?
Is there a comprehensive description of the linker command file?
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