2 files changed, 29 insertions, 7 deletions
diff --git a/os/various/memtest.cpp b/os/various/memtest.cpp
index 49828ec..175ac56 100644
--- a/os/various/memtest.cpp
+++ b/os/various/memtest.cpp
@@ -20,6 +20,8 @@
 
 #include "memtest.hpp"
 
+static unsigned int prng_seed = 42;
+
 /*
  *
  */
@@ -156,6 +158,8 @@ static void memtest_sequential(memtest_t *testp, Generator<T> &generator, T seed
   const size_t steps = testp->size / sizeof(T);
   size_t i;
   T *mem = static_cast<T *>(testp->start);
+  T got;
+  T expect;
 
   /* fill ram */
   generator.init(seed);
@@ -165,8 +169,10 @@ static void memtest_sequential(memtest_t *testp, Generator<T> &generator, T seed
   /* read back and compare */
   generator.init(seed);
   for (i=0; i<steps; i++) {
-    if (mem[i] != generator.get()) {
-      testp->ecb(testp, generator.get_type(), i*sizeof(T));
+    got = mem[i];
+    expect = generator.get();
+    if ((got != expect) && (nullptr != testp->errcb)) {
+      testp->errcb(testp, generator.get_type(), i, sizeof(T), got, expect);
       return;
     }
   }
@@ -210,7 +216,8 @@ template <typename T>
 static void moving_inversion_rand(memtest_t *testp) {
   GeneratorMovingInvRand<T> generator;
   T mask = -1;
-  memtest_sequential<T>(testp, generator, testp->rand_seed & mask);
+  prng_seed++;
+  memtest_sequential<T>(testp, generator, prng_seed & mask);
 }
 
 /*
diff --git a/os/various/memtest.hpp b/os/various/memtest.hpp
index 200db1f..ba686a3 100644
--- a/os/various/memtest.hpp
+++ b/os/various/memtest.hpp
@@ -37,7 +37,8 @@ typedef uint32_t testtype;
 /*
  * Error call back.
  */
-typedef void (*memtestecb_t)(memtest_t *testp, testtype type, size_t address);
+typedef void (*memtestecb_t)(memtest_t *testp, testtype type, size_t offset,
+                           size_t current_width, uint32_t got, uint32_t expect);
 
 /*
  *
@@ -45,18 +46,32 @@ typedef void (*memtestecb_t)(memtest_t *testp, testtype type, size_t address);
 typedef enum {
   MEMTEST_WIDTH_8,
   MEMTEST_WIDTH_16,
-  MEMTEST_WIDTH_32
+  MEMTEST_WIDTH_32,
 } memtest_bus_width_t;
 
 /*
  *
  */
 struct memtest_t {
+  /*
+   * Pointer to the test area start. Must be word aligned.
+   */
   void                *start;
+  /*
+   * Test area size in bytes.
+   */
   size_t              size;
+  /*
+   * Maximum width of transactions.
+   * Note: it implies all narrower tests.
+   * Note: width my be wider then your memory interface because AHB is
+   *       smart enough to split big transactions to smaller ones.
+   */
   memtest_bus_width_t width;
-  memtestecb_t        ecb;
-  unsigned int        rand_seed;
+  /*
+   * Error callback pointer. Set to NULL if unused.
+   */
+  memtestecb_t        errcb;
 };
 
 /*