sdram: improve memtest by adding 2 different writes/reads

doing only a write and read is not enough: if we reloaded a fpga with write that is not working after functional fpga, it would not trigger an error.

diff --git a/software/bios/sdram.c b/software/bios/sdram.c
index 186241434b5f40648fd971d6233d9a35688c83bd..140e11ef2bd4f001d6975a41bcf0f85f8e0b715a 100644 (file)
--- a/software/bios/sdram.c
+++ b/software/bios/sdram.c
@@ -40,7 +40,7 @@ void sdrrow(char *_row)
 {
        char *c;
        unsigned int row;
-       
+
        if(*_row == 0) {
                dfii_pi0_address_write(0x0000);
                dfii_pi0_baddress_write(0);
@@ -104,7 +104,7 @@ void sdrrd(char *startaddr, char *dq)
                        return;
                }
        }
-       
+
        dfii_pird_address_write(addr);
        dfii_pird_baddress_write(0);
        command_prd(DFII_COMMAND_CAS|DFII_COMMAND_CS|DFII_COMMAND_RDDATA);
@@ -185,7 +185,7 @@ void sdrwr(char *startaddr)
        for(p=0;p<DFII_NPHASES;p++)
                for(i=0;i<DFII_PIX_DATA_SIZE;i++)
                        MMPTR(dfii_pix_wrdata_addr[p]+4*i) = 0x10*p + i;
-       
+
        dfii_piwr_address_write(addr);
        dfii_piwr_baddress_write(0);
        command_pwr(DFII_COMMAND_CAS|DFII_COMMAND_WE|DFII_COMMAND_CS|DFII_COMMAND_WRDATA);
@@ -422,7 +422,7 @@ int sdrlevel(void)
 
 #endif /* DDRPHY_BASE */
 
-#define TEST_SIZE (4*1024*1024)
+#define TEST_SIZE (2*1024*1024)
 
 int memtest_silent(void)
 {
@@ -430,13 +430,22 @@ int memtest_silent(void)
        int i;
        unsigned int prv;
        unsigned int error_cnt;
-       
+
+       for(i=0;i<TEST_SIZE/4;i++) {
+               array[i] = 0x5A5A5A5A;
+       }
+       error_cnt = 0;
+       for(i=0;i<TEST_SIZE/4;i++) {
+               if(array[i] != 0x5A5A5A5A)
+                       error_cnt++;
+       }
+
        prv = 0;
        for(i=0;i<TEST_SIZE/4;i++) {
                prv = 1664525*prv + 1013904223;
                array[i] = prv;
        }
-       
+
        prv = 0;
        error_cnt = 0;
        for(i=0;i<TEST_SIZE/4;i++) {
@@ -464,7 +473,7 @@ int memtest(void)
 int sdrinit(void)
 {
        printf("Initializing SDRAM...\n");
-       
+
        init_sequence();
 #ifdef DDRPHY_BASE
        if(!sdrlevel())
@@ -473,7 +482,7 @@ int sdrinit(void)
        dfii_control_write(DFII_CONTROL_SEL);
        if(!memtest())
                return 0;
-       
+
        return 1;
 }