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authorEugene O'Brien <eugene.obrien@advantechamt.com>2007-10-23 08:29:10 +0200
committerStefan Roese <sr@denx.de>2007-10-31 21:20:51 +0100
commit9f798766aa85e62eb8fa8c721e148df609b78137 (patch)
tree8c39fec8978f1f2dc98be422b3a9d0aad1211764
parentafe9fa59cb63b4f9d16bf01c93eb212f25a38c2a (diff)
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ppc4xx: Fixed offset of refresh rate type for Bamboo on-board DDR SDRAM
This patch also adds a note to the fixed DDR setup for Bamboo NAND booting: Note: As found out by Eugene O'Brien <eugene.obrien@advantechamt.com>, the fixed DDR setup has problems (U-Boot crashes randomly upon TFTP), when the DIMM modules are still plugged in. So it is recommended to remove the DIMM modules while using the NAND booting code with the fixed SDRAM setup! Signed-off-by: Eugene O'Brien <eugene.obrien@advantechamt.com> Signed-off-by: Stefan Roese <sr@denx.de>
-rw-r--r--board/amcc/bamboo/bamboo.c4
-rw-r--r--nand_spl/board/amcc/bamboo/sdram.c6
2 files changed, 8 insertions, 2 deletions
diff --git a/board/amcc/bamboo/bamboo.c b/board/amcc/bamboo/bamboo.c
index 00c793a..c4eace5 100644
--- a/board/amcc/bamboo/bamboo.c
+++ b/board/amcc/bamboo/bamboo.c
@@ -67,13 +67,13 @@ const unsigned char cfg_simulate_spd_eeprom[128] = {
0x00, /* Module data width continued: +0 */
0x04, /* 2.5 Volt */
0x75, /* SDRAM Cycle Time (cas latency 2.5) = 7.5 ns */
+ 0x00, /* SDRAM Access from clock */
#ifdef CONFIG_DDR_ECC
0x02, /* ECC ON : 02 OFF : 00 */
#else
0x00, /* ECC ON : 02 OFF : 00 */
#endif
- 0x82, /* refresh Rate Type: Normal (15.625us) + Self refresh */
- 0,
+ 0x82, /* refresh Rate Type: Normal (7.8us) + Self refresh */
0,
0,
0x01, /* wcsbc = 1 */
diff --git a/nand_spl/board/amcc/bamboo/sdram.c b/nand_spl/board/amcc/bamboo/sdram.c
index 4f09072..ac77d06 100644
--- a/nand_spl/board/amcc/bamboo/sdram.c
+++ b/nand_spl/board/amcc/bamboo/sdram.c
@@ -44,6 +44,12 @@ static void wait_init_complete(void)
* not enough free space to implement the complete I2C SPD DDR autodetection
* routines. Therefore the Bamboo only supports the onboard 64MBytes of SDRAM
* when booting from NAND flash.
+ *
+ * Note:
+ * As found out by Eugene O'Brien <eugene.obrien@advantechamt.com>, the fixed
+ * DDR setup has problems (U-Boot crashes randomly upon TFTP), when the DIMM
+ * modules are still plugged in. So it is recommended to remove the DIMM
+ * modules while using the NAND booting code with the fixed SDRAM setup!
*/
void early_sdram_init(void)
{