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-/*
- * (C) Copyright 2002-2003
- * 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 & CONFIG_SYS_POST_MEMORY */
-
-/*
- * 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(const 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;
- 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(&(pattern[i]), pmem++);
- /*
- * Put a different pattern on the data lines: otherwise they
- * may float long enough to read back what we wrote.
- */
- move64(&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;
-
- printf ("Memory (date line) error at %08lx, "
- "wrote %08x%08x, read %08x%08x !\n",
- (ulong)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) {
- printf ("Memory (address line) error at %08lx<->%08lx, "
- "XOR value %08lx !\n",
- (ulong)testaddr, (ulong)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) {
- printf ("Memory error at %08lx, "
- "wrote %08lx, read %08lx !\n",
- (ulong)(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))) {
- printf ("Memory error at %08lx, "
- "wrote %08x, read %08lx !\n",
- (ulong)(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) {
- printf ("Memory error at %08lx, "
- "wrote %08lx, read %08lx !\n",
- (ulong)(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) {
- printf ("Memory error at %08lx, "
- "wrote %08lx, read %08lx !\n",
- (ulong)(mem + i), ~i, readback);
-
- ret = -1;
- break;
- }
- if (i % 1024 == 0)
- WATCHDOG_RESET ();
- }
-
- return ret;
-}
-
-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;
-}
-
-#if 0
-DECLARE_GLOBAL_DATA_PTR;
-
-int memory_post_test (int flags)
-{
- int ret = 0;
- bd_t *bd = gd->bd;
- phys_size_t memsize = (bd->bi_memsize >= 256 << 20 ?
- 256 << 20 : bd->bi_memsize) - (1 << 20);
-
-
- if (flags & POST_SLOWTEST) {
- ret = memory_post_tests (CONFIG_SYS_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 /* 0 */
-
-/* #endif */ /* CONFIG_POST & CONFIG_SYS_POST_MEMORY */
-/* #endif */ /* CONFIG_POST */