post/drivers/memory.c

5  * SPDX-License-Identifier:	GPL-2.0+
13  * o The recommended test sequence is to test the data lines: if they are
15  *   lines.  Finally, test the cells in the memory now that the test
16  *   program knows that the address and data lines work properly.
21  *   walk through a field of zeros on the address lines and the highest
27  *   write will charge the residual capacitance on the data bus so the
44  * Data line test:
45  * ---------------
46  * This tests data lines for shorts and opens by forcing adjacent data
47  * to opposite states. Because the data lines could be routed in an
71  * written to a different address in case the data lines are floating.
78  * ------------------
79  *  This function performs a test to verify that all the address lines
86  * To test all address lines, we start with the given base address and
96  *   0000 <- base
97  *   0001 <- test 1
98  *   0010 <- test 2
99  *   0100 <- test 3
100  *   1000 <- test 4
102  *   0010 <- base
103  *   0011 <- test 1
104  *   0000 <- (below the base address, skipped)
105  *   0110 <- test 2
106  *   1010 <- test 3
113  * Memory tests 1-4:
114  * -----------------
125  *  2)  bit-flip pattern ((1 << (offset % 32))
131  * RAM the following areas are verified: 0x00000000-0x00000800,
132  * 0x000ff800-0x00100800, 0x001ff800-0x00200800, ..., 0x03fff800-
133  * 0x04000000. If the test is run in slow-test mode, it verifies
152 #warning "Injecting data line errors for testing purposes"
161  * This function performs a double word move from the data at
164  * wide data bus.
181  * The "otherpattern" is written to drive the data bus to values other
182  * than the test pattern.  This is for detecting floating bus lines.
213 		 * Put a different pattern on the data lines: otherwise they  in memory_post_dataline()
216 		move64(&otherpattern, pmem--);  in memory_post_dataline()
230 			post_log("Memory (data line) error at %08x, "  in memory_post_dataline()
233 			ret = -1;  in memory_post_dataline()
261 				post_log("Memory (address line) error at %08x<->%08x, "  in memory_post_addrline()
264 				ret = -1;  in memory_post_addrline()
293 			ret = -1;  in memory_post_test1()
323 			ret = -1;  in memory_post_test2()
353 			ret = -1;  in memory_post_test3()
383 			ret = -1;  in memory_post_test4()
404 		ret = memory_post_addrline((ulong *)(start+size-8),  in memory_post_test_lines()
473 	bd_t *bd = gd->bd;  in arch_memory_test_prepare()
476 	*size = (gd->ram_size >= 256 << 20 ?  in arch_memory_test_prepare()
477 			256 << 20 : gd->ram_size) - (1 << 20);  in arch_memory_test_prepare()
481 		*size = (ulong)bd - *vstart;  in arch_memory_test_prepare()