Hi,
On Fri, 20 Jan 2012 08:07:41 -0200 Érico Porto ericoporto2008@gmail.com wrote:
Hello,
I want to stop autoboot and use mtest to check if my ram is alright, but 0x07FD2C00 forward freezes, and 0x00000902 also freezes, mtest, when using it. My ramsize is 0x08000000.
Does u-boot uses any parts of ram by itself, I mean, is there any known spots where I can't test because it would crash my system?
U-Boot relocates itself into RAM. You can check the address using 'bdinfo' command (look at 'relocaddr' in the output). There are also some data structures in RAM (global data, board info, stack, malloc area) and also exception vectors. Where it is located in RAM depends on your architecture and board configuration options. You can try to define DEBUG in the arch board.c file to get more info. Board config file should define CONFIG_SYS_MEMTEST_START and CONFIG_SYS_MEMTEST_END to prevent crashing when mtest is invoked.
HTH, Anatolij