We know "mfspr r0,638" can get the IMMR. But why? I checked "MPC82xx Reference Manual","G2 PowerPC™ Core Reference Manual","Programming Environments Manual", but I didn't find any word about that.How did the person who first known know?
"G2 PowerPC™ Core Reference Manual" where is the "SPR 638"? Table 3-33. Implementation-Specific SPR Encodings (mfspr) Decimal spr[5?9] spr[0?4] RegisterName Access 58 00001 11010 CSRR0 Supervisor 59 00001 11011 CSRR1 Supervisor 276 01000 10100 SPRG4 Supervisor 277 01000 10101 SPRG5 Supervisor 278 01000 10110 SPRG6 Supervisor 279 01000 10111 SPRG7 Supervisor 286 01000 11110 SVR Supervisor 309 01001 10101 IBCR Supervisor 310 01001 10110 DBCR Supervisor 311 01001 10111 MBAR Supervisor 317 01001 11101 DABR2 Supervisor 560 10001 10000 IBAT4U Supervisor 561 10001 10001 IBAT4L Supervisor 562 10001 10010 IBAT5U Supervisor 563 10001 10011 IBAT5L Supervisor 564 10001 10100 IBAT6U Supervisor 565 10001 10101 IBAT6L Supervisor 566 10001 10110 IBAT7U Supervisor 567 10001 10111 IBAT7L Supervisor 568 10001 11000 DBAT4U Supervisor 569 10001 11001 DBAT4L Supervisor 570 10001 11010 DBAT5U Supervisor 571 10001 11011 DBAT5L Supervisor 572 10001 11100 DBAT6U Supervisor 573 10001 11101 DBAT6L Supervisor 574 10001 11110 DBAT7U Supervisor 575 10001 11111 DBAT7L Supervisor 976 11110 10000 DMISS Supervisor 977 11110 10001 DCMP Supervisor 978 11110 10010 HASH1 Supervisor 979 11110 10011 HASH2 Supervisor 980 11110 10100 IMISS Supervisor 981 11110 10101 ICMP Supervisor 982 11110 10110 RPA Supervisor 1008 11111 10000 HID0 Supervisor 1009 11111 10001 HID1 Supervisor 1010 11111 10010 IABR Supervisor 1011 11111 10011 HID2 Supervisor 1013 11111 10101 DABR Supervisor 1018 11111 11010 IABR2 Supervisor ------------------------------ ?????Sogou.com?2G??????????! http://mail.sogou.com/recommend/sogoumail_invite_reg1.jsp?from=sogouinvitation&s_EMAIL=zengshuai%40sogou.com&username=linuxppc-embedded&FullName=linuxppc-embedded&Email=linuxppc-embedded%40ozlabs.org&verify=755eff4e640bdcfc57d93cbd8b0a9cb7
