diff options
Diffstat (limited to 'post/memory.c')
| -rw-r--r-- | post/memory.c | 483 |
1 files changed, 0 insertions, 483 deletions
diff --git a/post/memory.c b/post/memory.c deleted file mode 100644 index a2c088bad8..0000000000 --- a/post/memory.c +++ /dev/null @@ -1,483 +0,0 @@ -/* - * (C) Copyright 2002 - * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - */ - -#include <common.h> - -/* Memory test - * - * General observations: - * o The recommended test sequence is to test the data lines: if they are - * broken, nothing else will work properly. Then test the address - * lines. Finally, test the cells in the memory now that the test - * program knows that the address and data lines work properly. - * This sequence also helps isolate and identify what is faulty. - * - * o For the address line test, it is a good idea to use the base - * address of the lowest memory location, which causes a '1' bit to - * walk through a field of zeros on the address lines and the highest - * memory location, which causes a '0' bit to walk through a field of - * '1's on the address line. - * - * o Floating buses can fool memory tests if the test routine writes - * a value and then reads it back immediately. The problem is, the - * write will charge the residual capacitance on the data bus so the - * bus retains its state briefely. When the test program reads the - * value back immediately, the capacitance of the bus can allow it - * to read back what was written, even though the memory circuitry - * is broken. To avoid this, the test program should write a test - * pattern to the target location, write a different pattern elsewhere - * to charge the residual capacitance in a differnt manner, then read - * the target location back. - * - * o Always read the target location EXACTLY ONCE and save it in a local - * variable. The problem with reading the target location more than - * once is that the second and subsequent reads may work properly, - * resulting in a failed test that tells the poor technician that - * "Memory error at 00000000, wrote aaaaaaaa, read aaaaaaaa" which - * doesn't help him one bit and causes puzzled phone calls. Been there, - * done that. - * - * Data line test: - * --------------- - * This tests data lines for shorts and opens by forcing adjacent data - * to opposite states. Because the data lines could be routed in an - * arbitrary manner the must ensure test patterns ensure that every case - * is tested. By using the following series of binary patterns every - * combination of adjacent bits is test regardless of routing. - * - * ...101010101010101010101010 - * ...110011001100110011001100 - * ...111100001111000011110000 - * ...111111110000000011111111 - * - * Carrying this out, gives us six hex patterns as follows: - * - * 0xaaaaaaaaaaaaaaaa - * 0xcccccccccccccccc - * 0xf0f0f0f0f0f0f0f0 - * 0xff00ff00ff00ff00 - * 0xffff0000ffff0000 - * 0xffffffff00000000 - * - * To test for short and opens to other signals on our boards, we - * simply test with the 1's complemnt of the paterns as well, resulting - * in twelve patterns total. - * - * After writing a test pattern. a special pattern 0x0123456789ABCDEF is - * written to a different address in case the data lines are floating. - * Thus, if a byte lane fails, you will see part of the special - * pattern in that byte lane when the test runs. For example, if the - * xx__xxxxxxxxxxxx byte line fails, you will see aa23aaaaaaaaaaaa - * (for the 'a' test pattern). - * - * Address line test: - * ------------------ - * This function performs a test to verify that all the address lines - * hooked up to the RAM work properly. If there is an address line - * fault, it usually shows up as two different locations in the address - * map (related by the faulty address line) mapping to one physical - * memory storage location. The artifact that shows up is writing to - * the first location "changes" the second location. - * - * To test all address lines, we start with the given base address and - * xor the address with a '1' bit to flip one address line. For each - * test, we shift the '1' bit left to test the next address line. - * - * In the actual code, we start with address sizeof(ulong) since our - * test pattern we use is a ulong and thus, if we tried to test lower - * order address bits, it wouldn't work because our pattern would - * overwrite itself. - * - * Example for a 4 bit address space with the base at 0000: - * 0000 <- base - * 0001 <- test 1 - * 0010 <- test 2 - * 0100 <- test 3 - * 1000 <- test 4 - * Example for a 4 bit address space with the base at 0010: - * 0010 <- base - * 0011 <- test 1 - * 0000 <- (below the base address, skipped) - * 0110 <- test 2 - * 1010 <- test 3 - * - * The test locations are successively tested to make sure that they are - * not "mirrored" onto the base address due to a faulty address line. - * Note that the base and each test location are related by one address - * line flipped. Note that the base address need not be all zeros. - * - * Memory tests 1-4: - * ----------------- - * These tests verify RAM using sequential writes and reads - * to/from RAM. There are several test cases that use different patterns to - * verify RAM. Each test case fills a region of RAM with one pattern and - * then reads the region back and compares its contents with the pattern. - * The following patterns are used: - * - * 1a) zero pattern (0x00000000) - * 1b) negative pattern (0xffffffff) - * 1c) checkerboard pattern (0x55555555) - * 1d) checkerboard pattern (0xaaaaaaaa) - * 2) bit-flip pattern ((1 << (offset % 32)) - * 3) address pattern (offset) - * 4) address pattern (~offset) - * - * Being run in normal mode, the test verifies only small 4Kb - * regions of RAM around each 1Mb boundary. For example, for 64Mb - * RAM the following areas are verified: 0x00000000-0x00000800, - * 0x000ff800-0x00100800, 0x001ff800-0x00200800, ..., 0x03fff800- - * 0x04000000. If the test is run in slow-test mode, it verifies - * the whole RAM. - */ - -#ifdef CONFIG_POST - -#include <post.h> -#include <watchdog.h> - -#if CONFIG_POST & CFG_POST_MEMORY - -DECLARE_GLOBAL_DATA_PTR; - -/* - * Define INJECT_*_ERRORS for testing error detection in the presence of - * _good_ hardware. - */ -#undef INJECT_DATA_ERRORS -#undef INJECT_ADDRESS_ERRORS - -#ifdef INJECT_DATA_ERRORS -#warning "Injecting data line errors for testing purposes" -#endif - -#ifdef INJECT_ADDRESS_ERRORS -#warning "Injecting address line errors for testing purposes" -#endif - - -/* - * This function performs a double word move from the data at - * the source pointer to the location at the destination pointer. - * This is helpful for testing memory on processors which have a 64 bit - * wide data bus. - * - * On those PowerPC with FPU, use assembly and a floating point move: - * this does a 64 bit move. - * - * For other processors, let the compiler generate the best code it can. - */ -static void move64(unsigned long long *src, unsigned long long *dest) -{ -#if defined(CONFIG_MPC8260) || defined(CONFIG_MPC824X) - asm ("lfd 0, 0(3)\n\t" /* fpr0 = *scr */ - "stfd 0, 0(4)" /* *dest = fpr0 */ - : : : "fr0" ); /* Clobbers fr0 */ - return; -#else - *dest = *src; -#endif -} - -/* - * This is 64 bit wide test patterns. Note that they reside in ROM - * (which presumably works) and the tests write them to RAM which may - * not work. - * - * The "otherpattern" is written to drive the data bus to values other - * than the test pattern. This is for detecting floating bus lines. - * - */ -const static unsigned long long pattern[] = { - 0xaaaaaaaaaaaaaaaaULL, - 0xccccccccccccccccULL, - 0xf0f0f0f0f0f0f0f0ULL, - 0xff00ff00ff00ff00ULL, - 0xffff0000ffff0000ULL, - 0xffffffff00000000ULL, - 0x00000000ffffffffULL, - 0x0000ffff0000ffffULL, - 0x00ff00ff00ff00ffULL, - 0x0f0f0f0f0f0f0f0fULL, - 0x3333333333333333ULL, - 0x5555555555555555ULL -}; -const unsigned long long otherpattern = 0x0123456789abcdefULL; - - -static int memory_post_dataline(unsigned long long * pmem) -{ - unsigned long long temp64 = 0; - int num_patterns = sizeof(pattern)/ sizeof(pattern[0]); - int i; - unsigned int hi, lo, pathi, patlo; - int ret = 0; - - for ( i = 0; i < num_patterns; i++) { - move64((unsigned long long *)&(pattern[i]), pmem++); - /* - * Put a different pattern on the data lines: otherwise they - * may float long enough to read back what we wrote. - */ - move64((unsigned long long *)&otherpattern, pmem--); - move64(pmem, &temp64); - -#ifdef INJECT_DATA_ERRORS - temp64 ^= 0x00008000; -#endif - - if (temp64 != pattern[i]){ - pathi = (pattern[i]>>32) & 0xffffffff; - patlo = pattern[i] & 0xffffffff; - - hi = (temp64>>32) & 0xffffffff; - lo = temp64 & 0xffffffff; - - post_log ("Memory (date line) error at %08x, " - "wrote %08x%08x, read %08x%08x !\n", - pmem, pathi, patlo, hi, lo); - ret = -1; - } - } - return ret; -} - -static int memory_post_addrline(ulong *testaddr, ulong *base, ulong size) -{ - ulong *target; - ulong *end; - ulong readback; - ulong xor; - int ret = 0; - - end = (ulong *)((ulong)base + size); /* pointer arith! */ - xor = 0; - for(xor = sizeof(ulong); xor > 0; xor <<= 1) { - target = (ulong *)((ulong)testaddr ^ xor); - if((target >= base) && (target < end)) { - *testaddr = ~*target; - readback = *target; - -#ifdef INJECT_ADDRESS_ERRORS - if(xor == 0x00008000) { - readback = *testaddr; - } -#endif - if(readback == *testaddr) { - post_log ("Memory (address line) error at %08x<->%08x, " - "XOR value %08x !\n", - testaddr, target, xor); - ret = -1; - } - } - } - return ret; -} - -static int memory_post_test1 (unsigned long start, - unsigned long size, - unsigned long val) -{ - unsigned long i; - ulong *mem = (ulong *) start; - ulong readback; - int ret = 0; - - for (i = 0; i < size / sizeof (ulong); i++) { - mem[i] = val; - if (i % 1024 == 0) - WATCHDOG_RESET (); - } - - for (i = 0; i < size / sizeof (ulong) && ret == 0; i++) { - readback = mem[i]; - if (readback != val) { - post_log ("Memory error at %08x, " - "wrote %08x, read %08x !\n", - mem + i, val, readback); - - ret = -1; - break; - } - if (i % 1024 == 0) - WATCHDOG_RESET (); - } - - return ret; -} - -static int memory_post_test2 (unsigned long start, unsigned long size) -{ - unsigned long i; - ulong *mem = (ulong *) start; - ulong readback; - int ret = 0; - - for (i = 0; i < size / sizeof (ulong); i++) { - mem[i] = 1 << (i % 32); - if (i % 1024 == 0) - WATCHDOG_RESET (); - } - - for (i = 0; i < size / sizeof (ulong) && ret == 0; i++) { - readback = mem[i]; - if (readback != (1 << (i % 32))) { - post_log ("Memory error at %08x, " - "wrote %08x, read %08x !\n", - mem + i, 1 << (i % 32), readback); - - ret = -1; - break; - } - if (i % 1024 == 0) - WATCHDOG_RESET (); - } - - return ret; -} - -static int memory_post_test3 (unsigned long start, unsigned long size) -{ - unsigned long i; - ulong *mem = (ulong *) start; - ulong readback; - int ret = 0; - - for (i = 0; i < size / sizeof (ulong); i++) { - mem[i] = i; - if (i % 1024 == 0) - WATCHDOG_RESET (); - } - - for (i = 0; i < size / sizeof (ulong) && ret == 0; i++) { - readback = mem[i]; - if (readback != i) { - post_log ("Memory error at %08x, " - "wrote %08x, read %08x !\n", - mem + i, i, readback); - - ret = -1; - break; - } - if (i % 1024 == 0) - WATCHDOG_RESET (); - } - - return ret; -} - -static int memory_post_test4 (unsigned long start, unsigned long size) -{ - unsigned long i; - ulong *mem = (ulong *) start; - ulong readback; - int ret = 0; - - for (i = 0; i < size / sizeof (ulong); i++) { - mem[i] = ~i; - if (i % 1024 == 0) - WATCHDOG_RESET (); - } - - for (i = 0; i < size / sizeof (ulong) && ret == 0; i++) { - readback = mem[i]; - if (readback != ~i) { - post_log ("Memory error at %08x, " - "wrote %08x, read %08x !\n", - mem + i, ~i, readback); - - ret = -1; - break; - } - if (i % 1024 == 0) - WATCHDOG_RESET (); - } - - return ret; -} - -static int memory_post_tests (unsigned long start, unsigned long size) -{ - int ret = 0; - - if (ret == 0) - ret = memory_post_dataline ((unsigned long long *)start); - WATCHDOG_RESET (); - if (ret == 0) - ret = memory_post_addrline ((ulong *)start, (ulong *)start, size); - WATCHDOG_RESET (); - if (ret == 0) - ret = memory_post_addrline ((ulong *)(start + size - 8), - (ulong *)start, size); - WATCHDOG_RESET (); - if (ret == 0) - ret = memory_post_test1 (start, size, 0x00000000); - WATCHDOG_RESET (); - if (ret == 0) - ret = memory_post_test1 (start, size, 0xffffffff); - WATCHDOG_RESET (); - if (ret == 0) - ret = memory_post_test1 (start, size, 0x55555555); - WATCHDOG_RESET (); - if (ret == 0) - ret = memory_post_test1 (start, size, 0xaaaaaaaa); - WATCHDOG_RESET (); - if (ret == 0) - ret = memory_post_test2 (start, size); - WATCHDOG_RESET (); - if (ret == 0) - ret = memory_post_test3 (start, size); - WATCHDOG_RESET (); - if (ret == 0) - ret = memory_post_test4 (start, size); - WATCHDOG_RESET (); - - return ret; -} - -int memory_post_test (int flags) -{ - int ret = 0; - bd_t *bd = gd->bd; - unsigned long memsize = (bd->bi_memsize >= 256 << 20 ? - 256 << 20 : bd->bi_memsize) - (1 << 20); - - - if (flags & POST_SLOWTEST) { - ret = memory_post_tests (CFG_SDRAM_BASE, memsize); - } else { /* POST_NORMAL */ - - unsigned long i; - - for (i = 0; i < (memsize >> 20) && ret == 0; i++) { - if (ret == 0) - ret = memory_post_tests (i << 20, 0x800); - if (ret == 0) - ret = memory_post_tests ((i << 20) + 0xff800, 0x800); - } - } - - return ret; -} - -#endif /* CONFIG_POST & CFG_POST_MEMORY */ -#endif /* CONFIG_POST */ |
