Hello all,
I am working on enabling a POST-based memory test for an ARM-based processor. I have defined CONFIG_POST CONFIG_SYS_POST_MEMORY in include/configs/<board>.h; I have also defined CONFIG_POST_EXTERNAL_WORD_FUNCS and wrote some external word functions. U-Boot builds with no errors and works on the board; however, the memory test is not being run, and I'm trying to figure out why. Through some printf debugging I have determined that board_init_f() and board_init_r() are calling post_run(), as it should be (discussed in doc/README.POST). In trying to understand the code and what I can do to make this work, I have encountered some questions:
1. Since the memory test runs before U-Boot relocates to RAM, the memory test should be run during the post_run() call that happens in board_init_f() and not board_init_r(), correct? (I just want to clarify that I am understanding that correctly.)
1. What is the purpose of post_bootmode_get() (in post/post.c)?
1. In post_run() (in post/post.c), I noticed that an unsigned int called "last" is declared but never initialized with a value; however, "last" is then used as if it were initialized. Why is it that we can use this variable without initializing it, and what is the purpose of this variable?
1. Does memory_post_test() (as declared in post/tests.c and defined in post/drivers/memory.c) ever get called, and if so, where?
1. Ultimately, like I said, I am just trying to make the POST memory test work; if anyone has any suggestions as to what I can do to do this it would be greatly appreciated.
Thank you, -Lewis