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update readme

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This commit is contained in:
dwelch67
2013-05-04 21:46:01 -04:00
parent 0506d93411
commit 398904f7bb
7 changed files with 389 additions and 1 deletions
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3
README
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@@ -106,7 +106,8 @@ For each of these files, bootcode.bin and start.elf (NOT kernel.img,
dont need it, too big)(loader.bin is no longer used/required). Click
on the file name, it will go to another page then click on View Raw and
it will let you download the file. For reference, I do not use nor
have a config.txt file on my sd card. I only have the four files.
have a config.txt file on my sd card. I only have the three files (
bootcode.bin, start.elf, and then kernel.img from one of my examples).
My examples are basically the kernel.img file. Not a linux kernel,
just bare metal programs. Since the GPU bootloader is looking for

40
svc01/Makefile Normal file
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ARMGNU ?= arm-none-eabi
COPS = -Wall -O2 -nostdlib -nostartfiles -ffreestanding
gcc : svc01.hex svc01.bin
all : gcc
clean :
rm -f *.o
rm -f *.bin
rm -f *.hex
rm -f *.elf
rm -f *.list
rm -f *.img
rm -f *.bc
rm -f *.clang.opt.s
vectors.o : vectors.s
$(ARMGNU)-as vectors.s -o vectors.o
svc01.o : svc01.c
$(ARMGNU)-gcc $(COPS) -c svc01.c -o svc01.o
svc01.elf : memmap vectors.o svc01.o
$(ARMGNU)-ld vectors.o svc01.o -T memmap -o svc01.elf
$(ARMGNU)-objdump -D svc01.elf > svc01.list
svc01.bin : svc01.elf
$(ARMGNU)-objcopy svc01.elf -O binary svc01.bin
svc01.hex : svc01.elf
$(ARMGNU)-objcopy svc01.elf -O ihex svc01.hex

13
svc01/README Normal file
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See the top level README file for more information on documentation
and how to run these programs.
Derived from blinker08 and uart04
this is based on a question about svc calls, how to find the swi/svc
immediate.
Like interrupts I dont recommend using interrupts or svc calls unless
you have a really good reason to. they should be the exception not the
norm.

11
svc01/memmap Normal file
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MEMORY
{
ram : ORIGIN = 0x8000, LENGTH = 0x1000
}
SECTIONS
{
.text : { *(.text*) } > ram
.bss : { *(.bss*) } > ram
}

39
svc01/start.s Normal file
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;@-------------------------------------------------------------------------
;@-------------------------------------------------------------------------
.globl _start
_start:
mov sp,#0x8000
bl notmain
hang: b hang
.globl PUT32
PUT32:
str r1,[r0]
bx lr
.globl GET32
GET32:
ldr r0,[r0]
bx lr
.globl dummy
dummy:
bx lr
;@-------------------------------------------------------------------------
;@-------------------------------------------------------------------------
;@-------------------------------------------------------------------------
;@
;@ Copyright (c) 2012 David Welch dwelch@dwelch.com
;@
;@ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
;@
;@ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
;@
;@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
;@
;@-------------------------------------------------------------------------

148
svc01/svc01.c Normal file
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//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
extern void PUT32 ( unsigned int, unsigned int );
extern unsigned int GET32 ( unsigned int );
extern void dummy ( unsigned int );
extern void swi_test ( unsigned int );
extern void swi_test_thumb ( unsigned int );
#define GPFSEL1 0x20200004
#define GPSET0 0x2020001C
#define GPCLR0 0x20200028
#define GPPUD 0x20200094
#define GPPUDCLK0 0x20200098
#define AUX_ENABLES 0x20215004
#define AUX_MU_IO_REG 0x20215040
#define AUX_MU_IER_REG 0x20215044
#define AUX_MU_IIR_REG 0x20215048
#define AUX_MU_LCR_REG 0x2021504C
#define AUX_MU_MCR_REG 0x20215050
#define AUX_MU_LSR_REG 0x20215054
#define AUX_MU_MSR_REG 0x20215058
#define AUX_MU_SCRATCH 0x2021505C
#define AUX_MU_CNTL_REG 0x20215060
#define AUX_MU_STAT_REG 0x20215064
#define AUX_MU_BAUD_REG 0x20215068
#define IRQ_BASIC 0x2000B200
#define IRQ_PEND1 0x2000B204
#define IRQ_PEND2 0x2000B208
#define IRQ_FIQ_CONTROL 0x2000B210
#define IRQ_ENABLE1 0x2000B210
#define IRQ_ENABLE2 0x2000B214
#define IRQ_ENABLE_BASIC 0x2000B218
#define IRQ_DISABLE1 0x2000B21C
#define IRQ_DISABLE2 0x2000B220
#define IRQ_DISABLE_BASIC 0x2000B224
//GPIO14 TXD0 and TXD1
//GPIO15 RXD0 and RXD1
//alt function 5 for uart1
//alt function 0 for uart0
//((250,000,000/115200)/8)-1 = 270
//------------------------------------------------------------------------
void uart_init ( void )
{
unsigned int ra;
PUT32(AUX_ENABLES,1);
PUT32(AUX_MU_IER_REG,0);
PUT32(AUX_MU_CNTL_REG,0);
PUT32(AUX_MU_LCR_REG,3);
PUT32(AUX_MU_MCR_REG,0);
PUT32(AUX_MU_IER_REG,0x5); //enable rx interrupts
PUT32(AUX_MU_IIR_REG,0xC6);
PUT32(AUX_MU_BAUD_REG,270);
ra=GET32(GPFSEL1);
ra&=~(7<<12); //gpio14
ra|=2<<12; //alt5
ra&=~(7<<15); //gpio15
ra|=2<<15; //alt5
PUT32(GPFSEL1,ra);
PUT32(GPPUD,0);
for(ra=0;ra<150;ra++) dummy(ra);
PUT32(GPPUDCLK0,(1<<14)|(1<<15));
for(ra=0;ra<150;ra++) dummy(ra);
PUT32(GPPUDCLK0,0);
PUT32(AUX_MU_CNTL_REG,3);
}
//------------------------------------------------------------------------
void uart_putc ( unsigned int c )
{
while(1)
{
if(GET32(AUX_MU_LSR_REG)&0x20) break;
}
PUT32(AUX_MU_IO_REG,c);
}
//------------------------------------------------------------------------
void hexstrings ( unsigned int d )
{
//unsigned int ra;
unsigned int rb;
unsigned int rc;
rb=32;
while(1)
{
rb-=4;
rc=(d>>rb)&0xF;
if(rc>9) rc+=0x37; else rc+=0x30;
uart_putc(rc);
if(rb==0) break;
}
uart_putc(0x20);
}
//------------------------------------------------------------------------
void hexstring ( unsigned int d )
{
hexstrings(d);
uart_putc(0x0D);
uart_putc(0x0A);
}
//------------------------------------------------------------------------
int notmain ( unsigned int earlypc )
{
unsigned int ra;
uart_init();
hexstring(0x12345678);
for(ra=0;ra<20;ra++) hexstring(ra);
hexstring(0x12345678);
hexstring(earlypc);
for(ra=0x1000;ra<0x1010;ra++)
{
swi_test(ra);
}
for(ra=0x2000;ra<0x2010;ra++)
{
swi_test_thumb(ra);
}
return(0);
}
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//-------------------------------------------------------------------------
//
// Copyright (c) 2012 David Welch dwelch@dwelch.com
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//-------------------------------------------------------------------------

136
svc01/vectors.s Normal file
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;@-------------------------------------------------------------------------
;@-------------------------------------------------------------------------
.globl _start
_start:
ldr pc,reset_handler
ldr pc,undefined_handler
ldr pc,swi_handler
ldr pc,prefetch_handler
ldr pc,data_handler
ldr pc,unused_handler
ldr pc,irq_handler
ldr pc,fiq_handler
reset_handler: .word reset
undefined_handler: .word hang
swi_handler: .word swihand
prefetch_handler: .word hang
data_handler: .word hang
unused_handler: .word hang
irq_handler: .word hang
fiq_handler: .word hang
reset:
mov r0,#0x8000
mov r1,#0x0000
ldmia r0!,{r2,r3,r4,r5,r6,r7,r8,r9}
stmia r1!,{r2,r3,r4,r5,r6,r7,r8,r9}
ldmia r0!,{r2,r3,r4,r5,r6,r7,r8,r9}
stmia r1!,{r2,r3,r4,r5,r6,r7,r8,r9}
;@ (PSR_IRQ_MODE|PSR_FIQ_DIS|PSR_IRQ_DIS)
mov r0,#0xD2
msr cpsr_c,r0
mov sp,#0x8000
;@ (PSR_FIQ_MODE|PSR_FIQ_DIS|PSR_IRQ_DIS)
mov r0,#0xD1
msr cpsr_c,r0
mov sp,#0x4000
;@ (PSR_SVC_MODE|PSR_FIQ_DIS|PSR_IRQ_DIS)
mov r0,#0xD3
msr cpsr_c,r0
mov sp,#0x8000000
;@ SVC MODE, IRQ ENABLED, FIQ DIS
;@mov r0,#0x53
;@msr cpsr_c, r0
bl notmain
hang: b hang
.globl PUT32
PUT32:
str r1,[r0]
bx lr
.globl PUT16
PUT16:
strh r1,[r0]
bx lr
.globl PUT8
PUT8:
strb r1,[r0]
bx lr
.globl GET32
GET32:
ldr r0,[r0]
bx lr
.globl GETPC
GETPC:
mov r0,lr
bx lr
.globl BRANCHTO
BRANCHTO:
bx r0
.globl dummy
dummy:
bx lr
.globl enable_irq
enable_irq:
mrs r0,cpsr
bic r0,r0,#0x40
msr cpsr_c,r0
bx lr
swihand:
push {r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,lr}
mov r4,lr
bl hexstrings
mov r0,r4
bl hexstrings
ldr r0,[r4,#-4]
bl hexstring
pop {r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,r11,r12,lr}
movs pc,lr
.globl swi_test
swi_test:
push {lr}
swi 0x0D0000
pop {lr}
bx lr
.thumb
.thumb_func
.globl swi_test_thumb
swi_test_thumb:
push {lr}
swi 13
pop {r0}
bx r0
;@-------------------------------------------------------------------------
;@-------------------------------------------------------------------------
;@-------------------------------------------------------------------------
;@
;@ Copyright (c) 2012 David Welch dwelch@dwelch.com
;@
;@ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
;@
;@ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
;@
;@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
;@
;@-------------------------------------------------------------------------