post/drivers/memory.c

1 // SPDX-License-Identifier: GPL-2.0+
12  * o The recommended test sequence is to test the data lines: if they are
14  *   lines.  Finally, test the cells in the memory now that the test
15  *   program knows that the address and data lines work properly.
20  *   walk through a field of zeros on the address lines and the highest
26  *   write will charge the residual capacitance on the data bus so the
43  * Data line test:
44  * ---------------
45  * This tests data lines for shorts and opens by forcing adjacent data
46  * to opposite states. Because the data lines could be routed in an
70  * written to a different address in case the data lines are floating.
77  * ------------------
78  *  This function performs a test to verify that all the address lines
85  * To test all address lines, we start with the given base address and
95  *   0000 <- base
96  *   0001 <- test 1
97  *   0010 <- test 2
98  *   0100 <- test 3
99  *   1000 <- test 4
101  *   0010 <- base
102  *   0011 <- test 1
103  *   0000 <- (below the base address, skipped)
104  *   0110 <- test 2
105  *   1010 <- test 3
112  * Memory tests 1-4:
113  * -----------------
124  *  2)  bit-flip pattern ((1 << (offset % 32))
130  * RAM the following areas are verified: 0x00000000-0x00000800,
131  * 0x000ff800-0x00100800, 0x001ff800-0x00200800, ..., 0x03fff800-
132  * 0x04000000. If the test is run in slow-test mode, it verifies
151 #warning "Injecting data line errors for testing purposes"
160  * This function performs a double word move from the data at
163  * wide data bus.
180  * The "otherpattern" is written to drive the data bus to values other
181  * than the test pattern.  This is for detecting floating bus lines.
212 		 * Put a different pattern on the data lines: otherwise they  in memory_post_dataline()
215 		move64(&otherpattern, pmem--);  in memory_post_dataline()
229 			post_log("Memory (data line) error at %08x, "  in memory_post_dataline()
232 			ret = -1;  in memory_post_dataline()
260 				post_log("Memory (address line) error at %08x<->%08x, "  in memory_post_addrline()
263 				ret = -1;  in memory_post_addrline()
292 			ret = -1;  in memory_post_test1()
322 			ret = -1;  in memory_post_test2()
352 			ret = -1;  in memory_post_test3()
382 			ret = -1;  in memory_post_test4()
403 		ret = memory_post_addrline((ulong *)(start+size-8),  in memory_post_test_lines()
472 	bd_t *bd = gd->bd;  in arch_memory_test_prepare()
475 	*size = (gd->ram_size >= 256 << 20 ?  in arch_memory_test_prepare()
476 			256 << 20 : gd->ram_size) - (1 << 20);  in arch_memory_test_prepare()
480 		*size = (ulong)bd - *vstart;  in arch_memory_test_prepare()