diff --git a/cpu/ppc4xx/44x_spd_ddr2.c b/cpu/ppc4xx/44x_spd_ddr2.c
index c28fc463b5a025ccbff89ef72a5e6531b26afb7e..9a5340c35154569078da96de4b43db89d43627c5 100644
--- a/cpu/ppc4xx/44x_spd_ddr2.c
+++ b/cpu/ppc4xx/44x_spd_ddr2.c
@@ -137,6 +137,20 @@
#define MY_TLB_WORD2_I_ENABLE TLB_WORD2_I_ENABLE /* disable caching on SDRAM */
#endif
+/*
+ * Newer PPC's like 440SPe, 460EX/GT can be equipped with more than 2GB of SDRAM.
+ * To support such configurations, we "only" map the first 2GB via the TLB's. We
+ * need some free virtual address space for the remaining peripherals like, SoC
+ * devices, FLASH etc.
+ *
+ * Note that ECC is currently not supported on configurations with more than 2GB
+ * SDRAM. This is because we only map the first 2GB on such systems, and therefore
+ * the ECC parity byte of the remaining area can't be written.
+ */
+#ifndef CONFIG_MAX_MEM_MAPPED
+#define CONFIG_MAX_MEM_MAPPED ((phys_size_t)2 << 30)
+#endif
+
/*
* Board-specific Platform code can reimplement spd_ddr_init_hang () if needed
*/
@@ -181,7 +195,7 @@ typedef enum ddr_cas_id {
/*-----------------------------------------------------------------------------+
* Prototypes
*-----------------------------------------------------------------------------*/
-static unsigned long sdram_memsize(void);
+static phys_size_t sdram_memsize(void);
static void get_spd_info(unsigned long *dimm_populated,
unsigned char *iic0_dimm_addr,
unsigned long num_dimm_banks);
@@ -306,9 +320,9 @@ static unsigned char spd_read(uchar chip, uint addr)
/*-----------------------------------------------------------------------------+
* sdram_memsize
*-----------------------------------------------------------------------------*/
-static unsigned long sdram_memsize(void)
+static phys_size_t sdram_memsize(void)
{
- unsigned long mem_size;
+ phys_size_t mem_size;
unsigned long mcopt2;
unsigned long mcstat;
unsigned long mb0cf;
@@ -364,6 +378,8 @@ static unsigned long sdram_memsize(void)
mem_size+=4096;
break;
default:
+ printf("WARNING: Unsupported bank size (SDSZ=0x%x)!\n"
+ , sdsz);
mem_size=0;
break;
}
@@ -371,8 +387,7 @@ static unsigned long sdram_memsize(void)
}
}
- mem_size *= 1024 * 1024;
- return(mem_size);
+ return mem_size << 20;
}
/*-----------------------------------------------------------------------------+
@@ -400,7 +415,7 @@ phys_size_t initdram(int board_type)
unsigned long val;
ddr_cas_id_t selected_cas = DDR_CAS_5; /* preset to silence compiler */
int write_recovery;
- unsigned long dram_size = 0;
+ phys_size_t dram_size = 0;
num_dimm_banks = sizeof(iic0_dimm_addr);
@@ -558,6 +573,12 @@ phys_size_t initdram(int board_type)
/* get installed memory size */
dram_size = sdram_memsize();
+ /*
+ * Limit size to 2GB
+ */
+ if (dram_size > CONFIG_MAX_MEM_MAPPED)
+ dram_size = CONFIG_MAX_MEM_MAPPED;
+
/* and program tlb entries for this size (dynamic) */
/*
@@ -595,7 +616,7 @@ phys_size_t initdram(int board_type)
*/
set_mcsr(get_mcsr());
- return dram_size;
+ return sdram_memsize();
}
static void get_spd_info(unsigned long *dimm_populated,
@@ -2133,15 +2154,15 @@ static void program_memory_queue(unsigned long *dimm_populated,
unsigned long num_dimm_banks)
{
unsigned long dimm_num;
- unsigned long rank_base_addr;
+ phys_size_t rank_base_addr;
unsigned long rank_reg;
- unsigned long rank_size_bytes;
+ phys_size_t rank_size_bytes;
unsigned long rank_size_id;
unsigned long num_ranks;
unsigned long baseadd_size;
unsigned long i;
unsigned long bank_0_populated = 0;
- unsigned long total_size = 0;
+ phys_size_t total_size = 0;
/*------------------------------------------------------------------
* Reset the rank_base_address.
@@ -2289,6 +2310,11 @@ static void program_ecc(unsigned long *dimm_populated,
if (ecc == 0)
return;
+ if (sdram_memsize() > CONFIG_MAX_MEM_MAPPED) {
+ printf("\nWarning: Can't enable ECC on systems with more than 2GB of SDRAM!\n");
+ return;
+ }
+
mfsdram(SDRAM_MCOPT1, mcopt1);
mfsdram(SDRAM_MCOPT2, mcopt2);
@@ -2441,6 +2467,7 @@ static int short_mem_test(void)
u32 bxcf;
int i;
int j;
+ phys_size_t base_addr;
u32 test[NUMMEMTESTS][NUMMEMWORDS] = {
{0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF,
0x00000000, 0x00000000, 0xFFFFFFFF, 0xFFFFFFFF},
@@ -2467,10 +2494,17 @@ static int short_mem_test(void)
if ((bxcf & SDRAM_BXCF_M_BE_MASK) == SDRAM_BXCF_M_BE_ENABLE) {
/* Bank is enabled */
+ /*
+ * Only run test on accessable memory (below 2GB)
+ */
+ base_addr = SDRAM_RXBAS_SDBA_DECODE(mfdcr_any(SDRAM_R0BAS+bxcr_num));
+ if (base_addr >= CONFIG_MAX_MEM_MAPPED)
+ continue;
+
/*------------------------------------------------------------------
* Run the short memory test.
*-----------------------------------------------------------------*/
- membase = (u32 *)(SDRAM_RXBAS_SDBA_DECODE(mfdcr_any(SDRAM_R0BAS+bxcr_num)));
+ membase = (u32 *)(u32)base_addr;
for (i = 0; i < NUMMEMTESTS; i++) {
for (j = 0; j < NUMMEMWORDS; j++) {
diff --git a/include/asm-ppc/ppc4xx-sdram.h b/include/asm-ppc/ppc4xx-sdram.h
index 83931f17f53b32b979328fff9a029fae739dfc44..e151f0c11399d9476cc145895170374f6486f68b 100644
--- a/include/asm-ppc/ppc4xx-sdram.h
+++ b/include/asm-ppc/ppc4xx-sdram.h
@@ -284,8 +284,8 @@
#if defined(CONFIG_440SPE) || \
defined(CONFIG_460EX) || defined(CONFIG_460GT)
#define SDRAM_RXBAS_SDBA_MASK 0xFFE00000 /* Base address */
-#define SDRAM_RXBAS_SDBA_ENCODE(n) ((((u32)(n))&0xFFE00000)>>2)
-#define SDRAM_RXBAS_SDBA_DECODE(n) ((((u32)(n))&0xFFE00000)<<2)
+#define SDRAM_RXBAS_SDBA_ENCODE(n) ((u32)(((phys_size_t)(n) >> 2) & 0xFFE00000))
+#define SDRAM_RXBAS_SDBA_DECODE(n) ((((phys_size_t)(n)) & 0xFFE00000) << 2)
#endif /* CONFIG_440SPE */
#if defined(CONFIG_440SP)
#define SDRAM_RXBAS_SDBA_MASK 0xFF800000 /* Base address */
diff --git a/include/configs/katmai.h b/include/configs/katmai.h
index d3789bd67a89fac1c1b835d1ed2511faacd22a69..f07e470683a61ef00789c2db48c5ef831757ac92 100644
--- a/include/configs/katmai.h
+++ b/include/configs/katmai.h
@@ -40,6 +40,13 @@
#define CONFIG_SYS_CLK_FREQ 33333333 /* external freq to pll */
#define CFG_4xx_RESET_TYPE 0x2 /* use chip reset on this board */
+/*
+ * Enable this board for more than 2GB of SDRAM
+ */
+#define CONFIG_PHYS_64BIT
+#define CONFIG_VERY_BIG_RAM
+#define CONFIG_MAX_MEM_MAPPED ((phys_size_t)2 << 30)
+
/*
* Include common defines/options for all AMCC eval boards
*/