Date: Tue, 3 Jan 2012 01:37:24 +0100 From: Aleksander Dutkowski <adutkowski@gmail.com> To: freebsd-arm@freebsd.org Subject: porting freebsd to at91sam9g45 ( SBC6045 board) Message-ID: <CABkKHSbVEi6-0L%2BTX4tQSV2pa1Kp1RtkVKKPDe1rOF3oatfGGQ@mail.gmail.com>
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hi!
Ive just come from linux world to FreeBSD and I have SBC6045 board
based on at91sam9g45 SoC so Ive decided to try and port FBSD on it ;)
I have quite good knowledge in x86 processor internals like paging,
protected mode etc, but I haven't been programing low level on arm
arch yet.
Somebody created port for SAM9G20EK, so I tried to compile and run it:
cd /usr/arm // my own copy from svn
export TARGET=arm
export TARGET_ARCH=arm
export MAKEOBJDIRPREFIX=/usr/arm/obj
make buildkernel KERNCONF=SAM9G20EK
make installkernel KERNCONF=SAM9G20EK DESTDIR=/arm-kernel INSTALL_NODEBUG=t
file /arm-kernel/boot/kernel/kernel
kernel: ELF 32-bit LSB executable, ARM, version 1 (FreeBSD),
dynamically linked (uses shared libs), not stripped
And this is output from board's debug console:
----------------------------------------------------------------------------------------------
Start AT91Bootstrap...
U-Boot 1.3.4 (May 15 2011 - 11:23:14)
DRAM: 256 MB
## Unknown FLASH on Bank 1 - Size = 0x00000000 = 0 MB
Flash: 0 kB
NAND: 256 MiB
Error: 8 bit/pixel mode, but BMP has 32 bit/pixel
In: serial
Out: serial
Err: serial
Net: macb0
Hit any key to stop autoboot: 0
U-Boot> tftp 0x20000000 fbsd
macb0: Starting autonegotiation...
macb0: Autonegotiation complete
macb0: link up, 100Mbps full-duplex (lpa: 0x4de1)
Using macb0 device
TFTP from server 192.168.3.1; our IP address is 192.168.3.2
Filename 'fbsd'.
Load address: 0x20000000
Loading: #################################################################
#################################################################
#################################################################
###############################################################
done
Bytes transferred = 3775383 (399b97 hex)
U-Boot> go 0x200000C0
## Starting application at 0x200000C0 ...
----------------------------------------------------------------------------------------------
and it hangs - I can see that very early
Where did I get address 0x200000C0?
# readelf kernel -S | grep .text
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[ 1] .text PROGBITS c00000c0 0000c0 239e30 00 AX 0 0 32
# readelf kernel -s | grep _start
[...]
461: c00000c0 0 FUNC GLOBAL DEFAULT 1 _start
[...]
# cat /sys/arm/at91/std.sam9g20ek
makeoptions KERNPHYSADDR=0x20000000
makeoptions KERNVIRTADDR=0xc0000000
options KERNPHYSADDR=0x20000000
options KERNVIRTADDR=0xc0000000
so, based on http://wiki.freebsd.org/FreeBSDAtmel, Ive changed
0x200000E0 to 0x200000C0
Ive put all of this code because maybe you'll find some mistakes. But
I am now researching info and can't tell how fbsd should be booted. I
have seen some code made by mr Rafal Jaworowski where he ran loader(8)
from u-boot and then kernel. Is this proper way today to boot fbsd on
arm? Because Ive researched, that my kernel file is only a plain
kernel, no boot0, boot2, nor loader. But maybe executing loader will
be easier?
--
regards
Aleksander Dutkowski
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