sambuc/raspberrypi
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

an experiment to see the kernel8.img, kernel7.img differences in action

Browse Source
This commit is contained in:
root
2017-01-18 21:35:52 -05:00
parent abcbda2d00
commit 9a33349952
6 changed files with 366 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
boards/pi3/imgtest/Makefile Normal file
View File

@@ -0,0 +1,47 @@
ARMGNU64 ?= aarch64-none-elf
ARMGNU32 ?= arm-none-eabi
COPS = -Wall -O2 -nostdlib -nostartfiles -ffreestanding
gcc : kernel8.img kernel8-32.img kernel7.img kernel.img
all : gcc
clean :
rm -f *.o
rm -f *.bin
rm -f *.hex
rm -f *.elf
rm -f *.list
rm -f *.img
kernel8.img : memmap bs64.s notmain.c
$(ARMGNU64)-as bs64.s -o bs64.o
$(ARMGNU64)-gcc $(COPS) -c -DDEFINEME=0x800 notmain.c -o notmain.o
$(ARMGNU64)-ld bs64.o notmain.o -T memmap -o kernel8.elf
$(ARMGNU64)-objdump -D kernel8.elf > kernel8.list
$(ARMGNU64)-objcopy kernel8.elf -O binary kernel8.img
kernel8-32.img : memmap bs32.s notmain.c
$(ARMGNU32)-as bs32.s -o bs32.o
$(ARMGNU32)-gcc $(COPS) -c -DDEFINEME=0x832 notmain.c -o notmain.o
$(ARMGNU32)-ld bs32.o notmain.o -T memmap -o kernel8-32.elf
$(ARMGNU32)-objdump -D kernel8-32.elf > kernel8-32.list
$(ARMGNU32)-objcopy kernel8-32.elf -O binary kernel8-32.img
kernel7.img : memmap bs32.s notmain.c
$(ARMGNU32)-as bs32.s -o bs32.o
$(ARMGNU32)-gcc $(COPS) -c -DDEFINEME=0x700 notmain.c -o notmain.o
$(ARMGNU32)-ld bs32.o notmain.o -T memmap -o kernel7.elf
$(ARMGNU32)-objdump -D kernel7.elf > kernel7.list
$(ARMGNU32)-objcopy kernel7.elf -O binary kernel7.img
kernel.img : memmap bs32.s notmain.c
$(ARMGNU32)-as bs32.s -o bs32.o
$(ARMGNU32)-gcc $(COPS) -c -DDEFINEME=0x000 notmain.c -o notmain.o
$(ARMGNU32)-ld bs32.o notmain.o -T memmap -o kernel.elf
$(ARMGNU32)-objdump -D kernel.elf > kernel.list
$(ARMGNU32)-objcopy kernel.elf -O binary kernel.img

62
boards/pi3/imgtest/README Normal file
View File

@@ -0,0 +1,62 @@
See the top level README file for more information on documentation
and how to run these programs.
Sounds like this happened a while ago now, months, so I am just catching
up so they have provided a way to allow for 64 bit kernels without
having to load from zero and manage the cores and switching modes.
So what they are saying is it looks for the file kernel8.img then
kernel8-32.img then kernel7.img and last kernel.img and in that order
whichever it finds is the one it uses. So with only a current
bootcode.bin, start.elf and one or all of the files built here on
the flash whichever it finds in that order it uses, so you can put
all four .img files and it uses kernel8.img then delete that one and
then it uses kernel8-32.img and so on.
Yes you have to do the sd card dance.
So the output is below, interesting that in 64 bit mode either my
code to read the pc is wrong or they are starting at 0x80000 instead
of 0x8000.
There are no doubt other registers I could dump (note as this time I
didnt do the work to read the CPSR in 64 bit mode so it is just zero)
to see if there are any actual differences between the kernel8-32.img
and kernel7.img and kernel.img as far as how it loads, etc. I guess
I (you, we) could just dump the 0x0000 code they place to see if it
varies.
kernel8.img
12345678
00000800
00080264
00000000
12345678
kernel8-32.img
12345678
00008320
00008224
200001DA
12345678
kernel7.img
12345678
00000700
00008224
200001DA
12345678
kernel.img
12345678
00000000
00008224
200001DA
12345678

59
boards/pi3/imgtest/bs32.s Normal file
View File

@@ -0,0 +1,59 @@
;@-------------------------------------------------------------------
;@-------------------------------------------------------------------
.globl _start
_start:
mov sp,#0x80000
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 dummy
dummy:
bx lr
.globl GETCPSR
GETCPSR:
mrs r0,cpsr
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.
;@
;@-------------------------------------------------------------------

48
boards/pi3/imgtest/bs64.s Normal file
View File

@@ -0,0 +1,48 @@
//-------------------------------------------------------------------
//-------------------------------------------------------------------
.globl _start
_start:
mov sp,#0x80000
bl notmain
hang: b hang
.globl PUT32
PUT32:
str w1,[x0]
ret
.globl GET32
GET32:
ldr w0,[x0]
ret
.globl GETPC
GETPC:
mov x0,x30
ret
.globl GETCPSR
GETCPSR:
mov x0,#0
ret
.globl dummy
dummy:
ret
//-------------------------------------------------------------------
//-------------------------------------------------------------------
//-------------------------------------------------------------------
//
// 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.
//
//-------------------------------------------------------------------

12
boards/pi3/imgtest/memmap Normal file
View File

@@ -0,0 +1,12 @@
MEMORY
{
ram : ORIGIN = 0x8000, LENGTH = 0x1000
}
SECTIONS
{
.text : { *(.text*) } > ram
.bss : { *(.bss*) } > ram
}

138
boards/pi3/imgtest/notmain.c Normal file
View File

@@ -0,0 +1,138 @@
//-------------------------------------------------------------------
//-------------------------------------------------------------------
// 2 outer corner
// 4
// 6
// 8 TX out
// 10 RX in
extern void PUT32 ( unsigned int, unsigned int );
extern unsigned int GET32 ( unsigned int );
extern unsigned int GETPC ( void );
extern void dummy ( unsigned int );
extern unsigned int GETCPSR ( void );
//-------------------------------------------------------------------
#define PBASE 0x3F000000
extern void PUT32 ( unsigned int, unsigned int );
extern unsigned int GET32 ( unsigned int );
#define ARM_TIMER_CTL (PBASE+0x0000B408)
#define ARM_TIMER_CNT (PBASE+0x0000B420)
#define GPFSEL1 (PBASE+0x00200004)
#define GPSET0 (PBASE+0x0020001C)
#define GPCLR0 (PBASE+0x00200028)
#define GPPUD (PBASE+0x00200094)
#define GPPUDCLK0 (PBASE+0x00200098)
#define AUX_ENABLES (PBASE+0x00215004)
#define AUX_MU_IO_REG (PBASE+0x00215040)
#define AUX_MU_IER_REG (PBASE+0x00215044)
#define AUX_MU_IIR_REG (PBASE+0x00215048)
#define AUX_MU_LCR_REG (PBASE+0x0021504C)
#define AUX_MU_MCR_REG (PBASE+0x00215050)
#define AUX_MU_LSR_REG (PBASE+0x00215054)
#define AUX_MU_MSR_REG (PBASE+0x00215058)
#define AUX_MU_SCRATCH (PBASE+0x0021505C)
#define AUX_MU_CNTL_REG (PBASE+0x00215060)
#define AUX_MU_STAT_REG (PBASE+0x00215064)
#define AUX_MU_BAUD_REG (PBASE+0x00215068)
//-------------------------------------------------------------------
void uart_send ( unsigned int c )
{
while(1)
{
if(GET32(AUX_MU_LSR_REG)&0x20) break;
}
PUT32(AUX_MU_IO_REG,c);
}
//-------------------------------------------------------------------
void uart_flush ( void )
{
while(1)
{
if((GET32(AUX_MU_LSR_REG)&0x100)==0) break;
}
}
//-------------------------------------------------------------------
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_send(rc);
if(rb==0) break;
}
uart_send(0x20);
}
//-------------------------------------------------------------------
void hexstring ( unsigned int d )
{
hexstrings(d);
uart_send(0x0D);
uart_send(0x0A);
}
//-------------------------------------------------------------------
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,0);
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);
}
//-------------------------------------------------------------------
int notmain ( void )
{
uart_init();
hexstring(0x12345678);
hexstring(DEFINEME);
hexstring(GETPC());
hexstring(GETCPSR());
hexstring(0x12345678);
return(0);
}
//-------------------------------------------------------------------
//-------------------------------------------------------------------
//-------------------------------------------------------------------
//
// Copyright (c) 2014 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.
//
//-------------------------------------------------------------------