Date: Sat, 24 Dec 2022 19:15:43 -0800 From: Mark Millard <marklmi@yahoo.com> To: freebsd-arm <freebsd-arm@freebsd.org> Subject: How to make FreeBSD's kernel boot a RPi4B with modern RPi* firmware Message-ID: <9C037D3F-A440-4708-993D-117F313691BB@yahoo.com> References: <9C037D3F-A440-4708-993D-117F313691BB.ref@yahoo.com>
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I finally ran into EARLY_DRIVER_MODULE, BUS_PASS_RESOURCE,
BUS_PASS_ORDER_MIDDLE and the like and they allow being
sure that the brcm,bcm2835-dma related setup has been done
before any use of it is made, despite the order in the
Device Tree: use an earlier pass for brcm,bcm2835-dma
related attach. This avoids the kernel crashing during
boot.
The example context used below has: serial console with
USB3 SSD boot media (not requiring a usb_pgood_delay
setting), booting a stable/13. The RPI4B is a C0T one (no
3 GiByte limitation, for example: the PCIe wrapper logic
has been corrected).
stable/13's source code changes ( similarly for
releng/13.1 ):
diff --git a/sys/arm/broadcom/bcm2835/bcm2835_dma.c =
b/sys/arm/broadcom/bcm2835/bcm2835_dma.c
index cab8639bb607..d8b49acfe332 100644
--- a/sys/arm/broadcom/bcm2835/bcm2835_dma.c
+++ b/sys/arm/broadcom/bcm2835/bcm2835_dma.c
@@ -766,5 +766,6 @@ static driver_t bcm_dma_driver =3D {
=20
static devclass_t bcm_dma_devclass;
=20
-DRIVER_MODULE(bcm_dma, simplebus, bcm_dma_driver, bcm_dma_devclass, 0, =
0);
+EARLY_DRIVER_MODULE(bcm_dma, simplebus, bcm_dma_driver, =
bcm_dma_devclass,
+ 0, 0, BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);
MODULE_VERSION(bcm_dma, 1);
For reference, a 13S snapshot with my kernel build replacing
the snapshot's kernel, was booted with:
# strings /boot/msdos/start4.elf | grep VC_BUILD_ID_
VC_BUILD_ID_USER: dom
VC_BUILD_ID_TIME: 11:09:05
VC_BUILD_ID_VARIANT: start
VC_BUILD_ID_TIME: Oct 26 2022
VC_BUILD_ID_BRANCH: bcm2711_2
VC_BUILD_ID_HOSTNAME: buildbot
VC_BUILD_ID_PLATFORM: raspberrypi_linux
VC_BUILD_ID_VERSION: c72ad6b26ff40c91ef776b847436094ee63fabee (clean)
There are new things present that FreeBSD reports
but ignores, producing messages like:
clk_fixed4: <Fixed clock> disabled on ofwbus0
clk_fixed4: Cannot FDT parameters.
device_attach: clk_fixed4 attach returned 6
over and over during part of the boot. It seems to
retry as it goes and thus produce so many messages.
There was also:
fb0: <BCM2835 VT framebuffer driver> on simplebus0
fb0: changing fb bpp from 0 to 24
mbox0: mbox response error
fb0: bcm2835_mbox_fb_init failed, err=3D5
device_attach: fb0 attach returned 6
genet0 is working.
I've not checked if the microsd card slot can be used.
I used the normal FreeBSD U-Boot since I was not booting
the NVM3 media that requires extra time (usb_pgood_delay
would be assigned in my own U-Boot builds).
For reference, I used my typical sort of config.txt :
# more /boot/msdos/config.txt
[all]
arm_64bit=3D1
dtparam=3Daudio=3Don,i2c_arm=3Don,spi=3Don
dtoverlay=3Dmmc
dtoverlay=3Ddisable-bt
device_tree_address=3D0x4000
kernel=3Du-boot.bin
[pi4]
hdmi_safe=3D1
armstub=3Darmstub8-gic.bin
#
[all]
#
# Local addition that avoids USB3 SSD boot failures that look like:
# uhub_reattach_port: port ? reset failed, error=3DUSB_ERR_TIMEOUT
# uhub_reattach_port: device problem (USB_ERR_TIMEOUT), disabling port =
?
initial_turbo=3D60
# U-Boot that has, for example, a built-in usb_pgood_delay assignment
# for a media specific issue added:
#kernel=3Du-boot.bin.2022.10.arm64
#
# Local additions:
enable_uart=3D1
uart_2ndstage=3D1
dtdebug=3D1
disable_commandline_tags=3D1
disable_overscan=3D1
#gpu_mem_1024=3D32
#
#program_usb_boot_mode=3D1
#program_usb_boot_timeout=3D1
# Old RPi3's/RPi2Bv1.2's may ignore [pi4] and the like.
# That would make the below inappropriate for such contexts.
[pi4]
# Locally avoid hdmi_safe's dislay scaling:
hdmi_safe=3D0
#
armstub=3Darmstub8-gic.bin
#
# Local additions:
over_voltage=3D6
arm_freq=3D2000
sdram_freq_min=3D3200
force_turbo=3D1
#
#total_mem=3D1024
#total_mem=3D991
[all]
[pi3]=20
armstub=3Darmstub8.bin
dtoverlay=3Dpwm
audio_pwm_mode=3D0
[all]
As for main [so: 14], the devclass_t use is gone, thus
the source code changes are:
diff --git a/sys/arm/broadcom/bcm2835/bcm2835_dma.c =
b/sys/arm/broadcom/bcm2835/bcm2835_dma.c
index 5f9ecb0b7981..83c4c493a66b 100644
--- a/sys/arm/broadcom/bcm2835/bcm2835_dma.c
+++ b/sys/arm/broadcom/bcm2835/bcm2835_dma.c
@@ -764,5 +764,6 @@ static driver_t bcm_dma_driver =3D {
sizeof(struct bcm_dma_softc),
};
=20
-DRIVER_MODULE(bcm_dma, simplebus, bcm_dma_driver, 0, 0);
+EARLY_DRIVER_MODULE(bcm_dma, simplebus, bcm_dma_driver, 0, 0,
+ BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);
MODULE_VERSION(bcm_dma, 1);
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
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