Hello.
I'm trying to programm a bootloader for the MPC8548 but I have big problems with the MMU and remapping of the CCSR. After Reset the CCSR is located at 0xFF70_0000. So at first I init the TLB1 Entry 1 with the
following:
lis %r6,FSL_BOOKE_MAS0(1, 1, 0)@h
ori %r6,%r6,FSL_BOOKE_MAS0(1, 1, 0)@l
lis %r7,FSL_BOOKE_MAS1(1, 1, 0, 0, BOOKE_PAGESZ_1M)@h
ori %r7,%r7,FSL_BOOKE_MAS1(1, 1, 0, 0, BOOKE_PAGESZ_1M)@l
lis %r8,FSL_BOOKE_MAS2(0xFF700000, MAS2_I)@h
ori %r8,%r8,FSL_BOOKE_MAS2(0xFF700000, MAS2_I)@l
lis %r9,FSL_BOOKE_MAS3(0xFF700000, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h
ori %r9,%r9,FSL_BOOKE_MAS3(0xFF700000,0,(MAS3_SX|MAS3_SW|MAS3_SR))@l
mtspr MAS0,%r6
mtspr MAS1,%r7
mtspr MAS2,%r8
mtspr MAS3,%r9
isync
sync
.long 0x7C0007A4 //tlbwe, compiler doesn't support this opcodeAfter that I can set some GPIOs so I can see that it works. Now I wanted to relocate the CCSR to 0xE000_0000. So I followed the Instructions of the Manual Page 4-4:
lis %r3,0xFF700000@h
ori %r3, %r3, 0xFF700000@l
lwz %r4,0(%r3) /* Read CCSRBAR */
isync
lis %r4,(0xE0000000 >> 12)@h /* New Address for CCSRBAR */
ori %r4, %r4, (0xE0000000 >> 12)@l
stw %r4, 0(%r3)
li %r3, 0xFFFFF000@h /* Read somewhere in ROM */
ori %r3, %r3, 0xFFFFF000@l
lwz %r4, 0(%r3)
isync
/* Update TLB1,1 for new Address */
lis %r6,FSL_BOOKE_MAS0(1, 1, 0)@h
ori %r6,%r6,FSL_BOOKE_MAS0(1, 1, 0)@l
lis %r7,FSL_BOOKE_MAS1(1, 1, 0, 0, BOOKE_PAGESZ_1M)@h
ori %r7,%r7,FSL_BOOKE_MAS1(1, 1, 0, 0, BOOKE_PAGESZ_1M)@l
lis %r8,FSL_BOOKE_MAS2(0xE0000000 , MAS2_I)@h
ori %r8,%r8,FSL_BOOKE_MAS2(0xE0000000 , MAS2_I)@l
lis %r9,FSL_BOOKE_MAS3(0xE0000000,0,(MAS3_SX|MAS3_SW|MAS3_SR))@h
ori %r9,%r9,FSL_BOOKE_MAS3(0xE0000000,0,MAS3_SX|MAS3_SW|MAS3_SR))@l
mtspr MAS0,%r6
mtspr MAS1,%r7
mtspr MAS2,%r8
mtspr MAS3,%r9
isync
sync
.long 0x7C0007A4 //tlbwe
/* Read the content of CCSRBAR from new Address */
lis %r3,0xE0000000@h
ori %r3, %r3, 0xE0000000@l
lwz %r4,0(%r3)After that I don't have any access to the CCSR. What am I doing wrong?
Advice: FSL_BOOKE_MASX-Macros are from uboot 1.3.4:
#define FSL_BOOKE_MAS0(tlbsel,esel,nv) \
(MAS0_TLBSEL(tlbsel) | MAS0_ESEL(esel) | MAS0_NV(nv))
#define FSL_BOOKE_MAS1(v,iprot,tid,ts,tsize) \
((((v) << 31) & MAS1_VALID) |\
(((iprot) << 30) & MAS1_IPROT) |\
(MAS1_TID(tid)) |\
(((ts) << 12) & MAS1_TS) |\
(MAS1_TSIZE(tsize)))
#define FSL_BOOKE_MAS2(epn, wimge) \
(((epn) & MAS3_RPN) | (wimge))
#define FSL_BOOKE_MAS3(rpn, user, perms) \
(((rpn) & MAS3_RPN) | (user) | (perms))
I hope somebody can help me
Message Edited by Timmo on
2008-10-21 11:13 AM
