summaryrefslogtreecommitdiff
path: root/board/lubbock/memsetup.S
diff options
context:
space:
mode:
Diffstat (limited to 'board/lubbock/memsetup.S')
-rw-r--r--board/lubbock/memsetup.S665
1 files changed, 164 insertions, 501 deletions
diff --git a/board/lubbock/memsetup.S b/board/lubbock/memsetup.S
index c027834..5bbd859 100644
--- a/board/lubbock/memsetup.S
+++ b/board/lubbock/memsetup.S
@@ -39,12 +39,16 @@ DRAM_SIZE: .long CFG_DRAM_SIZE
.endm
+/*
+ * Memory setup
+ */
+
.globl memsetup
memsetup:
mov r10, lr
- /* Set up GPIO pins first */
+ /* Set up GPIO pins first ----------------------------------------- */
ldr r0, =GPSR0
ldr r1, =CFG_GPSR0_VAL
@@ -106,562 +110,284 @@ memsetup:
ldr r1, =CFG_GAFR2_U_VAL
str r1, [r0]
- /* enable GPIO pins */
- ldr r0, =PSSR
+ ldr r0, =PSSR /* enable GPIO pins */
ldr r1, =CFG_PSSR_VAL
str r1, [r0]
- ldr r3, =MSC1 /* low - bank 2 Lubbock Registers / SRAM */
- ldr r2, =CFG_MSC1_VAL /* high - bank 3 Ethernet Controller */
- str r2, [r3] /* need to set MSC1 before trying to write to the HEX LEDs */
- ldr r2, [r3] /* need to read it back to make sure the value latches (see MSC section of manual) */
-
- ldr r1, =LED_BLANK
- mov r0, #0xFF
- str r0, [r1] /* turn on hex leds */
-
-loop:
- ldr r0, =0xB0070001
- ldr r1, =_LED
- str r0, [r1] /* hex display */
-
-/*********************************************************************
- Initlialize Memory Controller
- The sequence below is based on the recommended init steps detailed
- in the EAS, chapter 5 (Chapter 10, Operating Systems Developers Guide)
-
-
- pause for 200 uSecs- allow internal clocks to settle
- *Note: only need this if hard reset... doing it anyway for now
-*/
-
- @ ---- Wait 200 usec
- ldr r3, =OSCR @ reset the OS Timer Count to zero
+ /* ---------------------------------------------------------------- */
+ /* Enable memory interface */
+ /* */
+ /* The sequence below is based on the recommended init steps */
+ /* detailed in the Intel PXA250 Operating Systems Developers Guide, */
+ /* Chapter 10. */
+ /* ---------------------------------------------------------------- */
+
+ /* ---------------------------------------------------------------- */
+ /* Step 1: Wait for at least 200 microsedonds to allow internal */
+ /* clocks to settle. Only necessary after hard reset... */
+ /* FIXME: can be optimized later */
+ /* ---------------------------------------------------------------- */
+
+ ldr r3, =OSCR /* reset the OS Timer Count to zero */
mov r2, #0
str r2, [r3]
- ldr r4, =0x300 @ really 0x2E1 is about 200usec, so 0x300 should be plenty
+ ldr r4, =0x300 /* really 0x2E1 is about 200usec, */
+ /* so 0x300 should be plenty */
1:
ldr r2, [r3]
cmp r4, r2
bgt 1b
mem_init:
- @ get memory controller base address
- ldr r1, =MEMC_BASE
-@****************************************************************************
-@ Step 1
-@
+ ldr r1, =MEMC_BASE /* get memory controller base addr. */
- @ write msc0, read back to ensure data latches
- @
+ /* ---------------------------------------------------------------- */
+ /* Step 2a: Initialize Asynchronous static memory controller */
+ /* ---------------------------------------------------------------- */
+
+ /* MSC registers: timing, bus width, mem type */
+
+ /* MSC0: nCS(0,1) */
ldr r2, =CFG_MSC0_VAL
str r2, [r1, #MSC0_OFFSET]
- ldr r2, [r1, #MSC0_OFFSET]
-
- @ write msc1
+ ldr r2, [r1, #MSC0_OFFSET] /* read back to ensure */
+ /* that data latches */
+ /* MSC1: nCS(2,3) */
ldr r2, =CFG_MSC1_VAL
str r2, [r1, #MSC1_OFFSET]
ldr r2, [r1, #MSC1_OFFSET]
- @ write msc2
+ /* MSC2: nCS(4,5) */
ldr r2, =CFG_MSC2_VAL
str r2, [r1, #MSC2_OFFSET]
ldr r2, [r1, #MSC2_OFFSET]
- @ write mecr
+ /* ---------------------------------------------------------------- */
+ /* Step 2b: Initialize Card Interface */
+ /* ---------------------------------------------------------------- */
+
+ /* MECR: Memory Expansion Card Register */
ldr r2, =CFG_MECR_VAL
str r2, [r1, #MECR_OFFSET]
+ ldr r2, [r1, #MECR_OFFSET]
- @ write mcmem0
+ /* MCMEM0: Card Interface slot 0 timing */
ldr r2, =CFG_MCMEM0_VAL
str r2, [r1, #MCMEM0_OFFSET]
+ ldr r2, [r1, #MCMEM0_OFFSET]
- @ write mcmem1
+ /* MCMEM1: Card Interface slot 1 timing */
ldr r2, =CFG_MCMEM1_VAL
str r2, [r1, #MCMEM1_OFFSET]
+ ldr r2, [r1, #MCMEM1_OFFSET]
- @ write mcatt0
+ /* MCATT0: Card Interface Attribute Space Timing, slot 0 */
ldr r2, =CFG_MCATT0_VAL
str r2, [r1, #MCATT0_OFFSET]
+ ldr r2, [r1, #MCATT0_OFFSET]
- @ write mcatt1
+ /* MCATT1: Card Interface Attribute Space Timing, slot 1 */
ldr r2, =CFG_MCATT1_VAL
str r2, [r1, #MCATT1_OFFSET]
+ ldr r2, [r1, #MCATT1_OFFSET]
- @ write mcio0
+ /* MCIO0: Card Interface I/O Space Timing, slot 0 */
ldr r2, =CFG_MCIO0_VAL
str r2, [r1, #MCIO0_OFFSET]
+ ldr r2, [r1, #MCIO0_OFFSET]
- @ write mcio1
+ /* MCIO1: Card Interface I/O Space Timing, slot 1 */
ldr r2, =CFG_MCIO1_VAL
str r2, [r1, #MCIO1_OFFSET]
+ ldr r2, [r1, #MCIO1_OFFSET]
- @-------------------------------------------------------
- @ 3rd bullet, Step 1
- @
+ /* ---------------------------------------------------------------- */
+ /* Step 2c: Write FLYCNFG FIXME: what's that??? */
+ /* ---------------------------------------------------------------- */
- @ get the mdrefr settings
- ldr r3, =CFG_MDREFR_VAL_100
- @ extract DRI field (we need a valid DRI field)
- @
- ldr r2, =0xFFF
+ /* ---------------------------------------------------------------- */
+ /* Step 2d: Initialize Timing for Sync Memory (SDCLK0) */
+ /* ---------------------------------------------------------------- */
- @ valid DRI field in r3
- @
- and r3, r3, r2
+ /* Before accessing MDREFR we need a valid DRI field, so we set */
+ /* this to power on defaults + DRI field. */
- @ get the reset state of MDREFR
- @
+ ldr r3, =CFG_MDREFR_VAL
+ ldr r2, =0xFFF
+ and r3, r3, r2
+ ldr r4, =0x03ca4000
+ orr r4, r4, r3
+ str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
ldr r4, [r1, #MDREFR_OFFSET]
- @ clear the DRI field
- @
- bic r4, r4, r2
-
- @ insert the valid DRI field loaded above
- @
- orr r4, r4, r3
-
- @ write back mdrefr
- @
- str r4, [r1, #MDREFR_OFFSET]
-
- @ *Note: preserve the mdrefr value in r4 *
-
-@****************************************************************************
-@ Step 2
-@
- /* This should be for SRAM, why is it commented out??? */
-
- @ fetch sxcnfg value
- @
- @ldr r2, =0
- @ write back sxcnfg
- @str r2, [r1, #SXCNFG_OFFSET]
-
-/* @if sxcnfg=0, don't program for synch-static memory */
- @cmp r2, #0
- @beq 1f
-
- @program sxmrs
- @ldr r2, =SXMRS_SETTINGS
- @str r2, [r1, #SXMRS_OFFSET]
-
-
-@****************************************************************************
-@ Step 3
-@
-
- @ Assumes previous mdrefr value in r4, if not then read current mdrefr
-
- @ clear the free-running clock bits
- @ (clear K0Free, K1Free, K2Free
- @
- bic r4, r4, #(0x00800000 | 0x01000000 | 0x02000000)
-
- @ set K1RUN if bank 0 installed
- @
- orr r4, r4, #0x00010000
-
-
-
-#ifdef THIS
-@<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<
-@<!<!<!<!<!<!<!<!<!<!<! Begin INSERT 1 <!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<
- @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
- @ Lubbock: Allow the user to select the {T/R/M} with predetermined
- @ SDCLK. Based on Table 3-1 in PXA250 and PXA210 Dev Man.
- @
- @ * = Must set MDREFR.K1DB2 to halve the MemClk for desired SDCLK[1]
- @
- @ S25, S26 used to provide all 400 MHz BIN values for Cotulla (0,0 - 1,3)
- @ S25, S26 used to provide all 200 MHz BIN values for Sabinal
- @
- @ S23: Force the halving of MemClk when deriving SDCLK[1]
- @ DOT: no override !DOT: halve (if not already forced half)
-/* @ *For certain MemClks, SDCLK's derivation is forced to be halved */
- @
- @ S24: Run/Turbo.
- @ DOT: Run mode !DOT: Turbo mode
- @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
-
- @
- @ Allow the user to control K1DB2 where applicable
- @
- @ Get the value of S23: @ 1 = DOT (unity), 0 = !DOT (halve it)
- @
- @ DOT: set K1DB2 (SDCLD = MemClk)
- @ !DOT: clear K1DB2 (SDCLK = MemClk/2)
- @
- @ldr r2, =FPGA_REGS_BASE_PHYSICAL
-
- bl GET_S23 @ r3, r2 @ get the value of S23 in R0, i put the base adx of fpga in r3
-
- cmp r3, #0x0 @ is !DOT?
- orreq r4, r4, #0x00020000 @ SDClk[1] = MemClk/2
- bicne r4, r4, #0x00020000 @ SDClk[1] = MemClk
-
- @
- @ Next, we need to look for S25,S26 selections that necessitate the
- @ halving of MemClk to derive SDCLK[1]: (S25,S26)={03-0C, 10-13}
- @ Override above S23-based selection accordingly.
- @
- ldr r2, =FPGA_REGS_BASE_PHYSICAL
- bl GET_S25 @ r0, r2
- @ get the value of S25 in R0, i put the base adx of fpga in r2
-
-
-
- ldr r2, =FPGA_REGS_BASE_PHYSICAL
- BL GET_S26 @ r3, r2
- @ get the value of S26 in R1, i put the base adx of fpga in r2
-
- orr r0, r0, r3 @ concatenate S25 & S26 vals
- and r0, r0, #0xFF
-
- @ Set K1DB2 for the frequencies that require it
- @
- cmp r0, #0x03
- cmpne r0, #0x04
- cmpne r0, #0x05
- cmpne r0, #0x06
- cmpne r0, #0x07
- cmpne r0, #0x08
- cmpne r0, #0x09
- cmpne r0, #0x0A
- cmpne r0, #0x0B
- cmpne r0, #0x0C
- cmpne r0, #0x10
- cmpne r0, #0x11
- cmpne r0, #0x12
- cmpne r0, #0x13
- orreq r4, r4, #0x00020000 @ SDCLK[1] = (MemClk)/2 for 03 - 0C @ 10 - 13
-
- @
- @ *Must make MSC0&1 adjustments now for MEMClks > 100MHz.
- @
- @ Adjust MSC0 for MemClks > 100 MHz
- @
- ldreq r0, [r1, #MSC0_OFFSET]
- ldreq r3, =0x7F007F00
- biceq r0, r0, r3 @ clear MSC0[14:12, 11:8] (RRR, RDN)
- ldreq r3, =0x46004600
- orreq r0, r0, r3 @ set MSC0[14, 10:9] (doubling RRR, RDN)
- streq r0, [r1, #MSC0_OFFSET]
- ldreq r0, [r1, #MSC0_OFFSET] @ read it back to ensure that the data latches
-
- @
- @ Adjust MSC1.LH for MemClks > 100 MHz
- @
- ldreq r0, [r1, #MSC1_OFFSET]
- ldreq r3, =0x7FF0
- biceq r0, r0, r3 @ clear MSC1[14:12, 11:8, 7:4] (RRR, RDN, RDF)
- ldreq r3, =0x4880
- orreq r0, r0, r3 @ set MSC1[14, 11, 7] (doubling RRR, RDN, RDF)
- streq r0, [r1, #MSC1_OFFSET]
- ldreq r0, [r1, #MSC1_OFFSET] @ read it back to ensure that the data latches
-
- @ @
- @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
-#endif
+ /* Note: preserve the mdrefr value in r4 */
-@<!<!<!<!<!<!<!<!<!<!<! End INSERT 1 <!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<
-@<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<!<
+ /* ---------------------------------------------------------------- */
+ /* Step 3: Initialize Synchronous Static Memory (Flash/Peripherals) */
+ /* ---------------------------------------------------------------- */
- @ write back mdrefr
- @
- str r4, [r1, #MDREFR_OFFSET]
- ldr r4, [r1, #MDREFR_OFFSET]
+ /* Initialize SXCNFG register. Assert the enable bits */
- @ deassert SLFRSH
- @
- bic r4, r4, #0x00400000
+ /* Write SXMRS to cause an MRS command to all enabled banks of */
+ /* synchronous static memory. Note that SXLCR need not be written */
+ /* at this time. */
- @ write back mdrefr
- @
- str r4, [r1, #MDREFR_OFFSET]
+ /* FIXME: we use async mode for now */
- @ assert E1PIN
- @
- orr r4, r4, #0x00008000
- @ write back mdrefr
- @
- str r4, [r1, #MDREFR_OFFSET]
+ /* ---------------------------------------------------------------- */
+ /* Step 4: Initialize SDRAM */
+ /* ---------------------------------------------------------------- */
+
+ /* set MDREFR according to user define with exception of a few bits */
+
+ ldr r4, =CFG_MDREFR_VAL
+ orr r4, r4, #(MDREFR_SLFRSH)
+ bic r4, r4, #(MDREFR_E1PIN|MDREFR_E0PIN)
+ str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
ldr r4, [r1, #MDREFR_OFFSET]
- nop
- nop
+ /* Step 4b: de-assert MDREFR:SLFRSH. */
-@****************************************************************************
-@ Step 4
-@
+ bic r4, r4, #(MDREFR_SLFRSH)
+ str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
+ ldr r4, [r1, #MDREFR_OFFSET]
- @ fetch platform value of mdcnfg
- @
- ldr r2, =CFG_MDCNFG_VAL
- @ disable all sdram banks
- @
- bic r2, r2, #(MDCNFG_DE0 | MDCNFG_DE1)
- bic r2, r2, #(MDCNFG_DE2 | MDCNFG_DE3)
+ /* Step 4c: assert MDREFR:E1PIN and E0PIO as desired */
- @ program banks 0/1 for bus width
- @
- bic r2, r2, #MDCNFG_DWID0 @0=32-bit
+ ldr r4, =CFG_MDREFR_VAL
+ str r4, [r1, #MDREFR_OFFSET] /* write back MDREFR */
+ ldr r4, [r1, #MDREFR_OFFSET]
- @ write initial value of mdcnfg, w/o enabling sdram banks
- @
- str r2, [r1, #MDCNFG_OFFSET]
+ /* Step 4d: write MDCNFG with MDCNFG:DEx deasserted (set to 0), to */
+ /* configure but not enable each SDRAM partition pair. */
-@ ****************************************************************************
-@ Step 5
-@
+ ldr r4, =CFG_MDCNFG_VAL
+ bic r4, r4, #(MDCNFG_DE0|MDCNFG_DE1)
- @ pause for 200 uSecs
- @
- ldr r3, =OSCR @reset the OS Timer Count to zero
+ str r4, [r1, #MDCNFG_OFFSET] /* write back MDCNFG */
+ ldr r4, [r1, #MDCNFG_OFFSET]
+
+
+ /* Step 4e: Wait for the clock to the SDRAMs to stabilize, */
+ /* 100..200 µsec. */
+
+ ldr r3, =OSCR /* reset the OS Timer Count to zero */
mov r2, #0
str r2, [r3]
- ldr r4, =0x300 @really 0x2E1 is about 200usec, so 0x300 should be plenty
+ ldr r4, =0x300 /* really 0x2E1 is about 200usec, */
+ /* so 0x300 should be plenty */
1:
ldr r2, [r3]
cmp r4, r2
bgt 1b
-@****************************************************************************
-@ Step 6
-@
-
- mov r0, #0x78 @turn everything off
- mcr p15, 0, r0, c1, c0, 0 @(caches off, MMU off, etc.)
-
+ /* Step 4f: Trigger a number (usually 8) refresh cycles by */
+ /* attempting non-burst read or write accesses to disabled */
+ /* SDRAM, as commonly specified in the power up sequence */
+ /* documented in SDRAM data sheets. The address(es) used */
+ /* for this purpose must not be cacheable. */
-@ ****************************************************************************
-@ Step 7
-@
- @ Access memory *not yet enabled* for CBR refresh cycles (8)
- @ - CBR is generated for all banks
+ ldr r3, =CFG_DRAM_BASE
+ str r2, [r3]
+ str r2, [r3]
+ str r2, [r3]
+ str r2, [r3]
+ str r2, [r3]
+ str r2, [r3]
+ str r2, [r3]
+ str r2, [r3]
- ldr r2, =CFG_DRAM_BASE
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
+ /* Step 4g: Write MDCNFG with enable bits asserted */
+ /* (MDCNFG:DEx set to 1). */
-@ ****************************************************************************
-@ Step 8: NOP (enable dcache if you wanna... we dont)
-@
-
-
-@ ****************************************************************************
-@ Step 9
-@
-
-
- @get memory controller base address
- @
- ldr r1, =MEMC_BASE
-
- @fetch current mdcnfg value
- @
ldr r3, [r1, #MDCNFG_OFFSET]
-
- @enable sdram bank 0 if installed (must do for any populated bank)
- @
- orr r3, r3, #MDCNFG_DE0
-
- @write back mdcnfg, enabling the sdram bank(s)
- @
+ orr r3, r3, #(MDCNFG_DE0|MDCNFG_DE1)
str r3, [r1, #MDCNFG_OFFSET]
+ /* Step 4h: Write MDMRS. */
-@****************************************************************************
-@ Step 10
-@
-
- @ write mdmrs
- @
ldr r2, =CFG_MDMRS_VAL
str r2, [r1, #MDMRS_OFFSET]
-@****************************************************************************
-@ Step 11: Final Step
-@
+ /* We are finished with Intel's memory controller initialisation */
+
-@INITINTC
- @********************************************************************
- @ Disable (mask) all interrupts at the interrupt controller
- @
+ /* ---------------------------------------------------------------- */
+ /* Disable (mask) all interrupts at interrupt controller */
+ /* ---------------------------------------------------------------- */
- @ clear the interrupt level register (use IRQ, not FIQ)
- @
- mov r1, #0
+initirqs:
+
+ mov r1, #0 /* clear int. level register (IRQ, not FIQ) */
ldr r2, =ICLR
str r1, [r2]
- @ mask all interrupts at the controller
- @
- ldr r2, =ICMR
+ ldr r2, =ICMR /* mask all interrupts at the controller */
str r1, [r2]
-@INITCLKS
- @ ********************************************************************
- @ Disable the peripheral clocks, and set the core clock
- @ frequency (hard-coding at 398.12MHz for now).
- @
+ /* ---------------------------------------------------------------- */
+ /* Clock initialisation */
+ /* ---------------------------------------------------------------- */
+
+initclks:
+
+ /* Disable the peripheral clocks, and set the core clock frequency */
+ /* (hard-coding at 398.12MHz for now). */
- @ Turn Off ALL on-chip peripheral clocks for re-configuration
- @ *Note: See label 'ENABLECLKS' for the re-enabling
- @
+ /* Turn Off ALL on-chip peripheral clocks for re-configuration */
+ /* Note: See label 'ENABLECLKS' for the re-enabling */
ldr r1, =CKEN
mov r2, #0
str r2, [r1]
- @ default value in case no valid rotary switch setting is found
- ldr r2, =(CCCR_L27 | CCCR_M2 | CCCR_N10) @ DEFAULT: {200/200/100}
+ /* default value in case no valid rotary switch setting is found */
+ ldr r2, =(CCCR_L27|CCCR_M2|CCCR_N10) /* DEFAULT: {200/200/100} */
-
- @... and write the core clock config register
- @
+ /* ... and write the core clock config register */
ldr r1, =CCCR
str r2, [r1]
-/* @ enable the 32Khz oscillator for RTC and PowerManager
- @
+#ifdef RTC
+ /* enable the 32Khz oscillator for RTC and PowerManager */
+
ldr r1, =OSCC
mov r2, #OSCC_OON
str r2, [r1]
-
- @ NOTE: spin here until OSCC.OOK get set,
- @ meaning the PLL has settled.
- @
+ /* NOTE: spin here until OSCC.OOK get set, meaning the PLL */
+ /* has settled. */
60:
ldr r2, [r1]
ands r2, r2, #1
beq 60b
-*/
-
-@OSCC_OON_DONE
-
-
-#ifdef A0_COTULLA
- @****************************************************************************
- @ !!! Take care of A0 Errata Sighting #4 --
- @ after a frequency change, the memory controller must be restarted
- @
-
- @ get memory controller base address
- ldr r1, =MEMC_BASE
-
- @ get the current state of MDREFR
- @
- ldr r2, [r1, #MDREFR_OFFSET]
-
- @ clear E0PIN, E1PIN
- @
- bic r3, r2, #(MDREFR_E0PIN | MDREFR_E1PIN)
-
- @ write MDREFR with E0PIN, E1PIN cleared (disable sdclk[0,1])
- @
- str r3, [r1, #MDREFR_OFFSET]
-
- @ then write MDREFR with E0PIN, E1PIN set (enable sdclk[0,1])
- @
- str r2, [r1, #MDREFR_OFFSET]
-
- @ get the current state of MDCNFG
- @
- ldr r3, [r1, #MDCNFG_OFFSET]
-
- @ disable all SDRAM banks
- @
- bic r3, r3, #(MDCNFG_DE0 | MDCNFG_DE1)
- bic r3, r3, #(MDCNFG_DE2 | MDCNFG_DE3)
-
- @ write back MDCNFG
- @
- ldr r3, [r1, #MDCNFG_OFFSET]
-
- @ Access memory not yet enabled for CBR refresh cycles (8)
- @ - CBR is generated for *all* banks
- ldr r2, =CFG_DRAM_BASE
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
- str r2, [r2]
-
- @ fetch current mdcnfg value
- @
- ldr r3, [r1, #MDCNFG_OFFSET]
-
- @ enable sdram bank 0 if installed
- @
- orr r3, r3, #MDCNFG_DE0
-
- @ write back mdcnfg, enabling the sdram bank(s)
- @
- str r3, [r1, #MDCNFG_OFFSET]
-
- @ write mdmrs
- @
- ldr r2, =CFG_MDMRS_VAL
- str r2, [r1, #MDMRS_OFFSET]
-
-
-
- /* @ errata: don't enable auto power-down */
- @ get current value of mdrefr
- @ldr r3, [r1, #MDREFR_OFFSET]
- @ enable auto-power down
- @orr r3, r3, #MDREFR_APD
- @write back mdrefr
- @str r3, [r1, #MDREFR_OFFSET]
-
-#endif A0_Cotulla
-
-
- ldr r0, =0x000C0dE3
- ldr r1, =_LED
- str r0, [r1] /* hex display */
-
-@ ^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%
-@ ^%^%^%^%^%^%^%^%^% above could be replaced by prememLLI ^%^%^%^%^%^%^%^%^%
-@ ^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%^%
+#endif
+ /* ---------------------------------------------------------------- */
+ /* */
+ /* ---------------------------------------------------------------- */
/* Save SDRAM size */
ldr r1, =DRAM_SIZE
str r8, [r1]
- ldr r0, =0xC0DE0006
- ldr r1, =_LED
- str r0, [r1] /* hex display */
-
- /* Interrupt init */
- /* Mask all interrupts */
+ /* Interrupt init: Mask all interrupts */
ldr r0, =ICMR /* enable no sources */
mov r1, #0
str r1, [r0]
+ /* FIXME */
+
#define NODEBUG
#ifdef NODEBUG
/*Disable software and data breakpoints */
@@ -676,74 +402,11 @@ mem_init:
#endif
- ldr r0, =0xBEEF001D
- ldr r1, =_LED
- str r0, [r1] /* hex display */
+ /* ---------------------------------------------------------------- */
+ /* End memsetup */
+ /* ---------------------------------------------------------------- */
- mov pc, r10
-
-@ End memsetup
-
-@ %%%%%%%%%%% Useful subroutines
-GET_S23:
- @ This macro will read S23 and return its value in r3
- @ r2 contains the base address of the Lubbock user registers
- ldr r2, =FPGA_REGS_BASE_PHYSICAL
-
- /*@ read S23's value */
- ldr r3, [r2, #USER_SWITCHES_OFFSET]
-
- @ mask out irrelevant bits
- and r3, r3, #0x200
-
- @ get bit into position 0
- mov r3, r3, LSR #9
-
- mov pc, lr
-@ End GET_S23
-
-
-GET_S24:
- @ This macro will read S24 and return its value in r0
- @ r2 contains the base address of the Lubbock user registers
- ldr r2, =FPGA_REGS_BASE_PHYSICAL
-
- /*@ read S24's value */
- ldr r0, [r2, #USER_SWITCHES_OFFSET]
-
- @ mask out irrelevant bits
- and r0, r0, #0x100
-
- @ get bit into position 0
- mov r0, r0, LSR #8
+endmemsetup:
mov pc, lr
-@ End GET_S23
-
-
-GET_S25:
- @ This macro will read rotary S25 and return its value in r0
- @ r2 contains the base address of the Lubbock user registers
- @ read the user switches register
- ldr r0, [r2, #USER_SWITCHES_OFFSET]
-
- @ mask out irrelevant bits
- and r0, r0, #0xF0
-
- mov pc, lr
-@ End subroutine
-
-
-GET_S26:
- @ This macro will read rotary S26 and return its value in r3
- @ r2 contains the base address of the Lubbock user registers
- @ read the user switches register
- ldr r3, [r2, #USER_SWITCHES_OFFSET]
-
- @ mask out irrelevant bits
- and r3, r3, #0x0F
-
- mov pc, lr
-@ End subroutine GET_S26
-
generated by cgit v1.1 at 2024-11-24 07:44:34 +0000