| wdenk | ba56f62 | 2004-02-06 23:19:44 +0000 | [diff] [blame] | 1 | XES XPedite1000 Board |
| 2 | |
| 3 | Last Update: December 29, 2003 |
| 4 | ======================================================================= |
| 5 | |
| 6 | This file contains some handy info regarding U-Boot and the XES |
| 7 | XPedite1000 PPC440GX PrPMC board. See the README.ppc440 for additional |
| 8 | information. |
| 9 | |
| 10 | |
| 11 | SWITCH SETTINGS & JUMPERS |
| 12 | ========================== |
| 13 | |
| 14 | Jumpers selected for AMD29LV040B flash part as the boot flash. |
| 15 | |
| 16 | |
| 17 | I2C Strap EEPROM & Environment Settings |
| 18 | ======================================= |
| 19 | |
| 20 | The XPedite1000 uses a single I2C eeprom for the 440 strappings and for |
| 21 | the environment variables. The first page (256 bytes) contains the |
| 22 | strappings and the 2 EMAC HW Ethernet addresses. Be careful not to |
| 23 | change the 1st page of the EEPROM! Unpopulated jumper J560 can get you |
| 24 | out of trouble as it disables the strapping read from EEPROM. |
| 25 | |
| 26 | I2C iprobe |
| 27 | ===================== |
| 28 | |
| 29 | The i2c utilities work and have been tested on Rev B. of the 440GX. See |
| 30 | README.ebony for more information about i2c probing with the 440. |
| 31 | |
| 32 | |
| 33 | GETTING OUT OF I2C TROUBLE |
| 34 | =========================== |
| 35 | |
| 36 | (Direct quote from README.ebony) |
| 37 | If you're like me ... you may have screwed up your bootstrap serial |
| 38 | eeprom ... or worse, your SPD eeprom when experimenting with the |
| 39 | i2c commands. If so, here are some ideas on how to get out of |
| 40 | trouble: |
| 41 | |
| 42 | Serial bootstrap eeprom corruption: |
| 43 | ----------------------------------- |
| 44 | Power down the board and set the following straps: |
| 45 | |
| 46 | J560 - closed |
| 47 | |
| 48 | This will select the default sys0 and sys1 settings (the serial |
| 49 | eeproms are not used). Then power up the board and fix the serial |
| 50 | eeprom using the imm command. Here are the values I currently |
| 51 | use: |
| 52 | |
| 53 | => imd 50 0 10 |
| 54 | |
| 55 | 0000: 85 7d 42 06 07 80 11 00 00 00 00 00 00 00 00 00 .}B............. |
| 56 | |
| 57 | Once you have the eeproms set correctly change the |
| 58 | J560 straps as you desire. |
| 59 | |
| 60 | |
| 61 | PPC440GX Ethernet EMACs |
| 62 | ======================= |
| 63 | |
| 64 | The XES XPedite1000 uses emac 2 & 3 and ignores emac 0 & 1. PHYs are connected |
| 65 | only to emac 2 & 3. The HW Ethernet addresses are read from the i2c eeprom and |
| 66 | placed in the bd info structure for enet2addr and enet3addr. The ethernet driver |
| 67 | senses that enetaddr and enet1addr are 0's and does not use them. |
| 68 | |
| 69 | As of this writing gigabit ethernet and the TCPIP acceleration hardware is not |
| 70 | supported. |
| 71 | |
| 72 | |
| 73 | Flash Support |
| 74 | ============= |
| 75 | |
| 76 | As of this writing, there is support for the 1/2mb boot flash only. User flash |
| 77 | is not yet supported. |
| 78 | |
| 79 | |
| 80 | Regards, |
| 81 | --Travis |
| 82 | <travis.sawyer@sandburst.com> |