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authorWolfgang Denk <wd@denx.de>2012-01-13 20:38:49 +0100
committerWolfgang Denk <wd@denx.de>2012-01-13 20:38:49 +0100
commit670c24f6f32c8320cbb950e19e75fa8cdc8af88c (patch)
treec78f685a6b104cd88def187574c8fdfcd4fbbcc4 /doc
parentf5bc38aba82a3cd96ee5ddbae3047f1caa31ed3c (diff)
parent3dc23c7c3093171d72da37cdefd82a81a5f613f5 (diff)
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Merge branch 'master' of git://git.denx.de/u-boot-mpc85xx
* 'master' of git://git.denx.de/u-boot-mpc85xx: fsl_lbc: add printout of LCRR and LBCR to local bus regs sbc8548: Fix up local bus init to be frequency aware sbc8548: enable support for hardware SPD errata workaround sbc8548: relocate fixed ddr init code to ddr.c file sbc8548: Make enabling SPD RAM configuration work sbc8548: Fix LBC SDRAM initialization settings sbc8548: enable ability to boot from alternate flash sbc8548: relocate 64MB user flash to sane boundary Revert "SBC8548: fix address mask to allow 64M flash" MPC85xxCDS: Fix missing LCRR_DBYP bits for 66-133MHz LBC eXMeritus HWW-1U-1A: Add support for the AT24C128N I2C EEPROM eXMeritus HWW-1U-1A: Minor environment variable tweaks
Diffstat (limited to 'doc')
-rw-r--r--doc/README.sbc854879
1 files changed, 74 insertions, 5 deletions
diff --git a/doc/README.sbc8548 b/doc/README.sbc8548
index 6cbe12f..0f3f543 100644
--- a/doc/README.sbc8548
+++ b/doc/README.sbc8548
@@ -62,6 +62,43 @@ a 33MHz PCI configuration is currently untested.)
02.00.00 0x1148 0x9e00 Network controller 0x00
=>
+Memory Size and using SPD:
+==========================
+
+The default configuration uses hard coded memory configuration settings
+for 256MB of DDR2 @400MHz. It does not by default use the DDR2 SPD
+EEPROM data to read what memory is installed.
+
+There is a hardware errata, which causes the older local bus SDRAM
+SPD EEPROM to land at the same address as the DDR2 SPD EEPROM, so
+that the SPD data can not be read reliably. You can test if your
+board has the errata fix by running "i2c probe". If you see 0x53
+as a valid device, it has been fixed. If you only see 0x50, 0x51
+then your board does not have the fix.
+
+You can also visually inspect the board to see if this hardware
+fix has been applied:
+
+ 1) Remove R314 (RES-R0174-033, 1K, 0603). R314 is located on
+ the back of the PCB behind the DDR SDRAM SODIMM connector.
+ 2) Solder RES-R0174-033 (1K, 0603) resistor from R314 pin 2 pad
+ to R313 pin 2. Pin 2 for each resistor is the end of the
+ resistor closest to the CPU.
+
+Boards without the mod will have R314 and R313 in parallel, like "||".
+After the mod, they will be touching and form an "L" shape.
+
+If you want to upgrade to larger RAM size, you can simply enable
+ #define CONFIG_SPD_EEPROM
+ #define CONFIG_DDR_SPD
+in include/configs/sbc8548.h file. (The lines are already there
+but listed as #undef).
+
+If you did the i2c test, and your board does not have the errata
+fix, then you will have to physically remove the LBC 128MB DIMM
+from the board's socket to resolve the above i2c address overlap
+issue and allow SPD autodetection of RAM to work.
+
Updating U-boot with U-boot:
============================
@@ -86,6 +123,33 @@ The "md" steps in the above are just a precautionary step that allow
you to confirm the u-boot version that was downloaded, and then confirm
that it was copied to flash.
+The above assumes that you are using the default board settings which
+have u-boot in the 8MB flash, tied to /CS0.
+
+If you are running the default 8MB /CS0 settings but want to store an
+image in the SODIMM that is built with CONFIG_SYS_ALT_BOOT enabled,
+(as a backup, etc) then the steps will become:
+
+ tftp u-boot.bin
+ md 200000 10
+ protect off all
+ era eff00000 efffffff
+ cp.b 200000 eff00000 100000
+ md eff00000 10
+ protect on all
+
+Finally, if you are running the alternate 64MB /CS0 settings and want
+to update the in-use u-boot image, then (again with CONFIG_SYS_ALT_BOOT
+enabled) the steps will become:
+
+ tftp u-boot.bin
+ md 200000 10
+ protect off all
+ era fff00000 ffffffff
+ cp.b 200000 fff00000 100000
+ md fff00000 10
+ protect on all
+
Hardware Reference:
===================
@@ -100,6 +164,9 @@ Boot flash:
Sodimm flash:
intel V28F128Jx, 16384x8 (4 devices) at 0xfb80_0000
+ Note that this address reflects the default setting for
+ the JTAG debugging tools, but since the alignment is
+ rather inconvenient, u-boot puts it at 0xec00_0000.
Jumpers:
@@ -124,10 +191,9 @@ JP19 PCI mode PCI PCI-X
onto /CS0 and the SODIMM flash on /CS6 (default). When JP12
is jumpered parallel to the LBC-SDRAM, then /CS0 is for the
SODIMM flash and /CS6 is for the boot flash. Note that in this
-alternate setting, you also need to switch SW2.8 to ON. Currently
-u-boot doesn't support booting off the SODIMM in this alternate
-setting without manually altering BR0/OR0 and BR6/OR6 in the
-board config file appropriately.
+alternate setting, you also need to switch SW2.8 to ON.
+See the setting CONFIG_SYS_ALT_BOOT if you want to use this setting
+and boot u-boot from the 64MB SODIMM
Switches:
@@ -187,9 +253,12 @@ start end CS<n> width Desc.
0000_0000 0fff_ffff MCS0,1 64 DDR2 (256MB)
f000_0000 f7ff_ffff CS3,4 32 LB SDRAM (128MB)
f800_0000 f8b0_1fff CS5 - EPLD
-fb80_0000 ff7f_ffff CS6 32 SODIMM flash (64MB)
+fb80_0000 ff7f_ffff CS6 32 SODIMM flash (64MB) [*]
ff80_0000 ffff_ffff CS0 8 Boot flash (8MB)
+[*] fb80 represents the default programmed by WR JTAG register files,
+ but u-boot places the flash at either ec00 or fc00 based on JP12.
+
The EPLD on CS5 demuxes the following devices at the following offsets:
offset size width device