Re: making debs for u-boot kernels
On Tuesday 23 July 2019 09:12:21 Stefan Monnier wrote:
> > So what tools do I use to build an installable kernel deb for a
> > u-boot system?
>
> I'm not sure what you mean.
The u-boot protocol assumes some of the files you see here:
pi@picnc:~ $ ls -la /boot
total 35466
drwxr-xr-x 3 root root 2560 Dec 31 1969 .
drwxr-xr-x 22 root root 4096 Jun 24 13:51 ..
-rwxr-xr-x 1 root root 23315 Sep 19 2018 bcm2708-rpi-0-w.dtb
-rwxr-xr-x 1 root root 22812 Sep 19 2018 bcm2708-rpi-b.dtb
-rwxr-xr-x 1 root root 23071 Sep 19 2018 bcm2708-rpi-b-plus.dtb
-rwxr-xr-x 1 root root 22589 Sep 19 2018 bcm2708-rpi-cm.dtb
-rwxr-xr-x 1 root root 24115 Sep 19 2018 bcm2709-rpi-2-b.dtb
-rwxr-xr-x 1 root root 25311 Sep 19 2018 bcm2710-rpi-3-b.dtb
-rwxr-xr-x 1 root root 25914 Feb 18 05:10 bcm2710-rpi-3-b-plus.dtb
-rwxr-xr-x 1 root root 24087 Sep 19 2018 bcm2710-rpi-cm3.dtb
-rwxr-xr-x 1 root root 52296 Feb 18 05:10 bootcode.bin
-rwxr-xr-x 1 root root 187 Dec 31 1979 cmdline.txt
-rwxr-xr-x 1 root root 1590 Apr 8 05:56 config.txt
-rwxr-xr-x 1 root root 18693 Mar 9 2018 COPYING.linux
-rwxr-xr-x 1 root root 2622 Apr 1 10:03 fixup_cd.dat
-rwxr-xr-x 1 root root 6701 Apr 1 10:03 fixup.dat
-rwxr-xr-x 1 root root 9750 Apr 1 10:03 fixup_db.dat
-rwxr-xr-x 1 root root 9752 Apr 1 10:03 fixup_x.dat
-rwxr-xr-x 1 root root 145 Apr 8 06:43 issue.txt
-rwxr-xr-x 1 root root 13173096 Jun 23 18:59 kernel7.img
-rwxr-xr-x 1 root root 10637100 Jun 23 17:35 kernel.img
-rwxr-xr-x 1 root root 1494 Mar 9 2018 LICENCE.broadcom
-rwxr-xr-x 1 root root 18974 Apr 8 06:43 LICENSE.oracle
drwxr-xr-x 2 root root 13312 Apr 8 05:48 overlays
-rwxr-xr-x 1 root root 1844 Jun 23 16:08
realtimepi-wpa-supplicant.txt
-rwxr-xr-x 1 root root 683460 Apr 1 10:03 start_cd.elf
-rwxr-xr-x 1 root root 4830756 Apr 1 10:03 start_db.elf
-rwxr-xr-x 1 root root 2873444 Apr 1 10:03 start.elf
-rwxr-xr-x 1 root root 3774980 Apr 1 10:03 start_x.elf
Are located at fixed offsets from the disks LSN0. This is because the
very limited, not even a bios, boot can find what it needs by lba
addressing. So the /boot dir you see above is only for human eyes, but
in fact bootcode.bin and the kernel images above are actually at fixed
lba offsets. So the installer has to get them, not by a directory
entry, but at those fixed address's
Or at least thats what it says in the original u-boot docs that I have.
>
> My BananaPi here uses the stock Debian kernels without any trouble.
> Both the vmlinuz and the dtb files are read as-is by U-Boot.
> The only thing I need to do is to package the initrd using `mkimage`
> (found in `u-boot-tools`).
>
> See the /boot/GNUmakefile I use to help me do that, below
I have no such file as can be see above, in the /boot partition of the
u-sd card.
>
> Stefan
This is I presume named GNUMakefile and is called by
make -f GNUMakefile
?
>
> # Make it so that `make` checks the timestamp of symlinks as well.
> MAKEFLAGS += -L
>
> MACHINE = $(shell set -- $$(tr '\0' '\n' <
> /proc/device-tree/compatible | sed 's/.*,//'); echo "$$2-$$1") VERSION
> := $(shell ls -l vmlinuz | sed 's/.* -> vmlinuz-//')
>
> LN = ln -sf
> CP = cp
>
> all: boot.scr uinitrd.img $(MACHINE).dtb
>
> boot.scr: boot.cmd
> mkimage -C none -A arm -T script -d $< $@
>
> uinitrd.img: uinitrd.img-$(VERSION) vmlinuz
> $(LN) "$<" "$@"
>
> uinitrd.img-%: initrd.img-%
> mkimage -A arm -T ramdisk -C none -n uInitrd -d "$<" "$@"
>
> $(MACHINE).dtb: $(MACHINE)-$(VERSION).dtb vmlinuz
> $(LN) "$<" "$@"
>
> $(MACHINE)-$(VERSION).dtb:
> /usr/lib/linux-image-$(VERSION)/$(MACHINE).dtb $(CP) "$<" "$@"
Thanks for any further clarification, Stefan Monnier.
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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