X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Froms%2Fu-boot%2Fboard%2Famcc%2Febony%2FREADME;fp=qemu%2Froms%2Fu-boot%2Fboard%2Famcc%2Febony%2FREADME;h=4df00b35612d4b25d105505a782dd8e427a85bd3;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git diff --git a/qemu/roms/u-boot/board/amcc/ebony/README b/qemu/roms/u-boot/board/amcc/ebony/README new file mode 100644 index 000000000..4df00b356 --- /dev/null +++ b/qemu/roms/u-boot/board/amcc/ebony/README @@ -0,0 +1,136 @@ + AMCC Ebony Board + + Last Update: September 12, 2002 +======================================================================= + +This file contains some handy info regarding U-Boot and the AMCC +Ebony evaluation board. See the README.ppc440 for additional +information. + + +SWITCH SETTINGS & JUMPERS +========================== + +Here's what I've been using successfully. If you feel inclined to +change things ... please read the docs! + +DIPSW U46 U80 +------------------------ +SW 1 off on +SW 2 on on +SW 3 on on +SW 4 off on +SW 5 on off +SW 6 on on +SW 7 on off +SW 8 on off + +J41: strapped +J42: open + +All others are factory default. + + +I2C probe +===================== + +The i2c utilities have been tested on both Rev B. and Rev C. and +look good. The CONFIG_SYS_I2C_NOPROBES macro is defined to prevent +probing the CDCV850 clock controller at address 0x69 (since reading +it causes the i2c implementation to misbehave. The output of +'i2c probe' should look like this (assuming you are only using a single +SO-DIMM: + +=> i2c probe +Valid chip addresses: 50 53 54 +Excluded chip addresses: 69 + + +GETTING OUT OF I2C TROUBLE +=========================== + +If you're like me ... you may have screwed up your bootstrap serial +eeprom ... or worse, your SPD eeprom when experimenting with the +i2c commands. If so, here are some ideas on how to get out of +trouble: + +Serial bootstrap eeprom corruption: +----------------------------------- +Power down the board and set the following straps: + +J41 - open +J42 - strapped + +This will select the default sys0 and sys1 settings (the serial +eeproms are not used). Then power up the board and fix the serial +eeprom using the 'i2c mm' command. Here are the values I currently +use: + +=> i2c md 50 0 10 +0000: bf a2 04 01 ae 94 11 00 00 00 00 00 00 00 00 00 ................ + +=> i2c md 54 0 10 +0000: 8f b3 24 01 4d 14 11 00 00 00 00 00 00 00 00 00 ..$.M........... + +Once you have the eeproms set correctly change the +J41/J42 straps as you desire. + +SPD eeprom corruption: +------------------------ +I've corrupted the SPD eeprom several times ... perhaps too much coffee +and not enough presence of mind ;-). By default, the ebony code uses +the SPD to initialize the DDR SDRAM control registers. So if the SPD +eeprom is corrupted, U-Boot will never get into ram. Here's how I got +out of this situation: + +0. First, _before_ playing with the i2c utilities, do an 'i2c probe', then +use 'i2c md' to capture the various device contents to a file. Some day +you may be glad you did this ... trust me :-). Otherwise try the +following: + +1. In the include/configs/EBONY.h file find the line that defines +the CONFIG_SPD_EEPROM macro and undefine it. E.g: + +#undef CONFIG_SPD_EEPROM + +This will make the code use default SDRAM control register +settings without using the SPD eeprom. + +2. Rebuild U-Boot + +3. Load the new U-Boot image and reboot ebony. + +4. Repair the SPD eeprom using the 'i2c mm' command. Here's the eeprom +contents that work with the default SO-DIMM that comes with the +ebony board (micron 8VDDT164AG-265A1). Note: these are probably +_not_ the factory settings ... but they work. + +=> i2c md 53 0 10 80 +0000: 80 08 07 0c 0a 01 40 00 04 75 75 00 80 08 00 01 ......@..uu..... +0010: 0e 04 0c 01 02 20 00 a0 75 00 00 50 3c 50 2d 20 ..... ..u..P