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upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/board/gth2/lowlevel_init.S

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/* Memory sub-system initialization code */
#include <config.h>
#include <version.h>
#include <asm/regdef.h>
#include <asm/au1x00.h>
#include <asm/mipsregs.h>
#define CP0_Config0 $16
#define MEM_1MS ((CFG_MHZ) * 1000)
#define GPIO_RJ1LY (1<<22)
#define GPIO_CFRESET (1<<10)
.text
.set noreorder
.set mips32
.globl lowlevel_init
lowlevel_init:
/*
* Step 2) Establish Status Register
* (set BEV, clear ERL, clear EXL, clear IE)
*/
li t1, 0x00400000
mtc0 t1, CP0_STATUS
/*
* Step 3) Establish CP0 Config0
* (set OD, set K0=3)
*/
li t1, 0x00080003
mtc0 t1, CP0_CONFIG
/*
* Step 4) Disable Watchpoint facilities
*/
li t1, 0x00000000
mtc0 t1, CP0_WATCHLO
mtc0 t1, CP0_IWATCHLO
/*
* Step 5) Disable the performance counters
*/
mtc0 zero, CP0_PERFORMANCE
nop
/*
* Step 6) Establish EJTAG Debug register
*/
mtc0 zero, CP0_DEBUG
nop
/*
* Step 7) Establish Cause
* (set IV bit)
*/
li t1, 0x00800000
mtc0 t1, CP0_CAUSE
/* Establish Wired (and Random) */
mtc0 zero, CP0_WIRED
nop
/* No workaround if running from ram */
lui t0, 0xffc0
lui t3, 0xbfc0
and t1, ra, t0
bne t1, t3, noCacheJump
nop
/*** From AMD YAMON ***/
/*
* Step 8) Initialize the caches
*/
li t0, (16*1024)
li t1, 32
li t2, 0x80000000
addu t3, t0, t2
cacheloop:
cache 0, 0(t2)
cache 1, 0(t2)
addu t2, t1
bne t2, t3, cacheloop
nop
/* Save return address */
move t3, ra
/* Run from cacheable space now */
bal cachehere
nop
cachehere:
li t1, ~0x20000000 /* convert to KSEG0 */
and t0, ra, t1
addi t0, 5*4 /* 5 insns beyond cachehere */
jr t0
nop
/* Restore return address */
move ra, t3
/*
* Step 9) Initialize the TLB
*/
li t0, 0 # index value
li t1, 0x00000000 # entryhi value
li t2, 32 # 32 entries
tlbloop:
/* Probe TLB for matching EntryHi */
mtc0 t1, CP0_ENTRYHI
tlbp
nop
/* Examine Index[P], 1=no matching entry */
mfc0 t3, CP0_INDEX
li t4, 0x80000000
and t3, t4, t3
addiu t1, t1, 1 # increment t1 (asid)
beq zero, t3, tlbloop
nop
/* Initialize the TLB entry */
mtc0 t0, CP0_INDEX
mtc0 zero, CP0_ENTRYLO0
mtc0 zero, CP0_ENTRYLO1
mtc0 zero, CP0_PAGEMASK
tlbwi
/* Do it again */
addiu t0, t0, 1
bne t0, t2, tlbloop
nop
/* First setup pll:s to make serial work ok */
/* We have a 12.5 MHz crystal */
li t0, SYS_CPUPLL
li t1, 0x28 /* CPU clock, 500 MHz */
sw t1, 0(t0)
sync
nop
nop
/* wait 1mS for clocks to settle */
li t1, MEM_1MS
1: add t1, -1
bne t1, zero, 1b
nop
/* Setup AUX PLL */
li t0, SYS_AUXPLL
li t1, 0
sw t1, 0(t0) /* aux pll */
sync
/* Static memory controller */
/* RCE0 - can not change while fetching, do so from icache */
move t2, ra /* Store return address */
bal getAddr
nop
getAddr:
move t1, ra
move ra, t2 /* Move return addess back */
cache 0x14,0(t1)
cache 0x14,32(t1)
/*** /From YAMON ***/
noCacheJump:
/* Static memory controller */
/* RCE0 AMD 29LV800 Flash */
li t0, MEM_STCFG0
li t1, 0x00000243
sw t1, 0(t0)
li t0, MEM_STTIME0
li t1, 0x040181D7 /* FIXME */
sw t1, 0(t0)
li t0, MEM_STADDR0
li t1, 0x11E03F80
sw t1, 0(t0)
/* RCE1 PCMCIA 250ns */
li t0, MEM_STCFG1
li t1, 0x00000002
sw t1, 0(t0)
li t0, MEM_STTIME1
li t1, 0x280E3E07
sw t1, 0(t0)
li t0, MEM_STADDR1
li t1, 0x10000000
sw t1, 0(t0)
/* RCE2 CP Altera */
li t0, MEM_STCFG2
li t1, 0x00000280 /* BE, EW */
sw t1, 0(t0)
li t0, MEM_STTIME2
li t1, 0x0303000c
sw t1, 0(t0)
li t0, MEM_STADDR2
li t1, 0x10c03f80 /* 1 MB */
sw t1, 0(t0)
/* RCE3 DP Altera */
li t0, MEM_STCFG3
li t1, 0x00000280 /* BE, EW */
sw t1, 0(t0)
li t0, MEM_STTIME3
li t1, 0x0303000c
sw t1, 0(t0)
li t0, MEM_STADDR3
li t1, 0x10e03f80 /* 1 MB */
sw t1, 0(t0)
sync
/* Set peripherals to a known state */
li t0, IC0_CFG0CLR
li t1, 0xFFFFFFFF
sw t1, 0(t0)
li t0, IC0_CFG0CLR
sw t1, 0(t0)
li t0, IC0_CFG1CLR
sw t1, 0(t0)
li t0, IC0_CFG2CLR
sw t1, 0(t0)
li t0, IC0_SRCSET
sw t1, 0(t0)
li t0, IC0_ASSIGNSET
sw t1, 0(t0)
li t0, IC0_WAKECLR
sw t1, 0(t0)
li t0, IC0_RISINGCLR
sw t1, 0(t0)
li t0, IC0_FALLINGCLR
sw t1, 0(t0)
li t0, IC0_TESTBIT
li t1, 0x00000000
sw t1, 0(t0)
sync
li t0, IC1_CFG0CLR
li t1, 0xFFFFFFFF
sw t1, 0(t0)
li t0, IC1_CFG0CLR
sw t1, 0(t0)
li t0, IC1_CFG1CLR
sw t1, 0(t0)
li t0, IC1_CFG2CLR
sw t1, 0(t0)
li t0, IC1_SRCSET
sw t1, 0(t0)
li t0, IC1_ASSIGNSET
sw t1, 0(t0)
li t0, IC1_WAKECLR
sw t1, 0(t0)
li t0, IC1_RISINGCLR
sw t1, 0(t0)
li t0, IC1_FALLINGCLR
sw t1, 0(t0)
li t0, IC1_TESTBIT
li t1, 0x00000000
sw t1, 0(t0)
sync
li t0, SYS_FREQCTRL0
li t1, 0x00000000
sw t1, 0(t0)
li t0, SYS_FREQCTRL1
li t1, 0x00000000
sw t1, 0(t0)
li t0, SYS_CLKSRC
li t1, 0x00000000
sw t1, 0(t0)
li t0, SYS_PININPUTEN
li t1, 0x00000000
sw t1, 0(t0)
sync
li t0, 0xB1100100
li t1, 0x00000000
sw t1, 0(t0)
li t0, 0xB1400100
li t1, 0x00000000
sw t1, 0(t0)
li t0, SYS_WAKEMSK
li t1, 0x00000000
sw t1, 0(t0)
li t0, SYS_WAKESRC
li t1, 0x00000000
sw t1, 0(t0)
/* wait 1mS before setup */
li t1, MEM_1MS
1: add t1, -1
bne t1, zero, 1b
nop
/* SDCS 0 SDRAM */
li t0, MEM_SDMODE0
li t1, 0x592CD1
sw t1, 0(t0)
li t0, MEM_SDMODE1
li t1, 0x00000000
sw t1, 0(t0)
li t0, MEM_SDMODE2
li t1, 0x00000000
sw t1, 0(t0)
/* 64 MB SDRAM at addr 0 */
li t0, MEM_SDADDR0
li t1, 0x001003F0
sw t1, 0(t0)
li t0, MEM_SDADDR1
li t1, 0x00000000
sw t1, 0(t0)
li t0, MEM_SDADDR2
li t1, 0x00000000
sw t1, 0(t0)
sync
li t0, MEM_SDREFCFG
li t1, 0x880007A1 /* Disable */
sw t1, 0(t0)
sync
li t0, MEM_SDPRECMD
sw zero, 0(t0)
sync
li t0, MEM_SDAUTOREF
sw zero, 0(t0)
sync
sw zero, 0(t0)
sync
li t0, MEM_SDREFCFG
li t1, 0x8A0007A1 /* Enable */
sw t1, 0(t0)
sync
li t0, MEM_SDWRMD0
li t1, 0x00000023
sw t1, 0(t0)
sync
/* wait 1mS after setup */
li t1, MEM_1MS
1: add t1, -1
bne t1, zero, 1b
nop
/* Setup GPIO pins */
li t0, SYS_PINFUNC
li t1, 0x00007025 /* 0x8080 */
sw t1, 0(t0)
li t0, SYS_TRIOUTCLR
li t1, 0xFFFFFFFF /* 0x1FFF */
sw t1, 0(t0)
/* Turn yellow front led on */
/* Release reset on CF */
li t0, SYS_OUTPUTCLR
li t1, GPIO_RJ1LG
sw t1, 0(t0)
li t0, SYS_OUTPUTSET
li t1, GPIO_RJ1LY|GPIO_CFRESET
sw t1, 0(t0)
sync
j clearmem
nop
#if 0
.globl memtest
#endif
memtest:
/* Fill memory with address */
li t0, 0x80000000
li t1, 0xFFF000 /* 64 MB */
mt0: sw t0, 0(t0)
add t1, -1
add t0, 4
bne t1, zero, mt0
nop
nop
/* Verify addr */
li t0, 0x80000000
li t1, 0xFFF000 /* 64 MB */
mt1: lw t2, 0(t0)
bne t0, t2, memhang
add t1, -1
add t0, 4
bne t1, zero, mt1
nop
nop
#if 0
.globl clearmem
#endif
clearmem:
/* Clear memory */
li t0, 0x80000000
li t1, 0xFFF000 /* 64 MB */
mtc: sw zero, 0(t0)
add t1, -1
add t0, 4
bne t1, zero, mtc
nop
nop
memtestend:
jr ra
nop
memhang:
b memhang
nop