u-boot/doc/README.POST

93   1) Tests running before relocating to RAM
95      These tests will run immediately after initializing RAM
100   2) Tests running after relocating to RAM
122 #define POST_RAM		0x200	/* test runs in RAM */
134      otherwise all tests running in ROM/RAM (depending on the flag
203      should be run at (before or after relocating to RAM), whether it
238 save it in non-volatile RAM (NVRAM), transfer it to a dedicated
409      This test will examine RAM and check it for errors. The test
411      amount of RAM will be checked. On power-fail booting a fool
520 The CPU test will run in RAM in order to allow run-time modification
606 The CPU test will run in RAM in order to allow run-time modification
611 The memory test will verify RAM using sequential writes and reads
612 to/from RAM. Specifically, there will be several test cases that will
613 use different patterns to verify RAM. Each test case will first fill
614 a region of RAM with one pattern and then read the region back and
630 when RAM represents a cyclically repeated portion of a smaller size.
633 of RAM around each 1Mb boundary. For example, for 64Mb RAM the
637 whole RAM.
639 The memory test will run in ROM before relocating U-Boot to RAM in
640 order to allow RAM modification without saving its contents.