README.xpedite1k 2.4 KB

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