Date: Sun, 11 Oct 2020 09:39:07 +0000 From: Robert Crowston <crowston@protonmail.com> To: Mark Millard <marklmi@yahoo.com> Cc: Kyle Evans <kevans@FreeBSD.org>, freebsd-arm <freebsd-arm@freebsd.org>, Klaus Cucinauomo <maciphone2@googlemail.com> Subject: Re: RPi4B: modern firmware vs. Device tree loaded to 0x4000 (size 0xbe0c) [fails] vs. to 0x1f0000 (size 0xbd90) [works]? Message-ID: <lpyT9wr2OGowIcUoJ-TSyQTio0crIxugRQMBF98Vmm79z6bo2ULmLhaUoStf8ufqbjDDQPQpe3BjMGNSBeSn9ciZLZHcspb3IH1ph-2I8io=@protonmail.com> In-Reply-To: <2B1B21CB-1A63-42CE-8917-98870C88CACE@yahoo.com> References: <2B1B21CB-1A63-42CE-8917-98870C88CACE.ref@yahoo.com> <2B1B21CB-1A63-42CE-8917-98870C88CACE@yahoo.com>
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> My memory is that armstub8-gic.bin currently requires the > 0x4000 for the start of the device tree. In our patched version of armstub8-gic, we attempt to modify the device tre= e at runtime to add PSCI nodes (see https://github.com/gonzoua/rpi3-psci-mo= nitor/blob/master/fdtpatch.c#L133). That C function is called from assembly= . The only reference I can see to 0x4000 is that we use it for the top of t= he stack when we execute that C function (https://github.com/gonzoua/rpi3-p= sci-monitor/blob/master/pscimon.S#L172). In this case, the value is arbitra= ry, it just needs to be unused memory. We also pass 0x4000 as the second argument to the bootloader, but I do not = know what it does with it. =E2=80=94 RHC. =E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90 Original Me= ssage =E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90=E2=80=90 On Saturday, 10 October 2020 07:53, Mark Millard <marklmi@yahoo.com> wrote: > My evidence that suggests the possibility or likelyhood is . . . > > In a dies-rather-early modern-firmware boot context (even without > USB involved!) I see the following sorts of notices in the debug > output during very early RPi firmware activity: > > Read config.txt bytes 258 hnd 0x0000cfd2 hash '4f21032d556a3fd9' > recover4.elf not found (6) > recovery.elf not found (6) > Read start4.elf bytes 2283936 hnd 0x0000d88c hash 'ddddf81164f250ad' > Read fixup4.dat bytes 5422 hnd 0x0000e149 hash 'fdfbb390f4a2c93c' > > Note the "hnd" values. I presume those are memory locations > identifying memory that is then holding some value(s) (that > look to be of fairly long term utility). But I do not know > for sure. > > Somewhat later: > > MESS:00:00:06.001798:0: brfs: File read: /mfs/sd/bcm2711-rpi-4-b.dtb > MESS:00:00:06.005041:0: Loading 'bcm2711-rpi-4-b.dtb' to 0x4000 size 0xb9= 9c > . . . > MESS:00:00:07.226859:0: brfs: File read: /mfs/sd/armstub8-gic.bin > MESS:00:00:07.229885:0: Loading 'armstub8-gic.bin' to 0x0 size 0x1700 > MESS:00:00:07.236077:0: brfs: File read: 5888 bytes > MESS:00:00:07.354201:0: brfs: File read: /mfs/sd/u-boot.bin > MESS:00:00:07.356719:0: Loading 'u-boot.bin' to 0x80000 size 0x8b9c0 > MESS:00:00:07.362807:0: Device tree loaded to 0x4000 (size 0xbe0c) > > (I did not show re-reading config.txt, some HDMI notices, > loading of overlays, or the attempted open of the > non-existent cmdline.txt .) > > So: > > 0x4000 up to 0xF99c (which contains 0xcfd2, 0xd88c, and 0xe149) > (Even before armstub8-gic.bin is loaded.) > > 0x4000 up to 0xFE0C (which contains 0xcfd2, 0xd88c, and 0xe149) > (After armstub8-gic.bin and u-boot.bin have been loaded.) > > Only a few more lines are output before things are hung up: > > MESS:00:00:07.368908:0: uart: Set PL011 baud rate to 103448.300000 Hz > MESS:00:00:07.377816:0: uart: Baud rate change done... > MESS:00:00:07.379870:0: uart: Baud rate change done... > MESS:00:00:07.385266:0: gpioman: gpioman_get_pin_num: pin SDCARD_CONTROL_= POWER not defined > > (Note: Even a working boot for a microsd-card-only context > using older firmware gets the above set of 4 messages --but > keeps going.) > > (The re-reads of config.txt may mean that the initial/only > hnd listed for it no longer matters.) > > I see the same sort of hangup with modern firmware when a USB3 > SSD is in use instead of a microsd card: > > Read config.txt bytes 258 hnd 0x000080ec hash '241c057b26cdfc4e' > recover4.elf not found (6) > recovery.elf not found (6) > Read start4.elf bytes 2277248 hnd 0x00003df5 hash '8e98b15f075142da' > Read fixup4.dat bytes 5409 hnd 0x00003519 hash 'bdc1f053a4ad68f8' > > vs. > > MESS:00:00:06.184750:0: Loading 'bcm2711-rpi-4-b.dtb' to 0x4000 size 0xb9= 9c > . . . > MESS:00:00:09.317648:0: Device tree loaded to 0x4000 (size 0xbe0c) > > Again the "hnd" point inside the area that later holds the Device Tree. > > Again: > > MESS:00:00:09.323596:0: uart: Set PL011 baud rate to 103448.300000 Hz > MESS:00:00:09.332661:0: uart: Baud rate change done... > MESS:00:00:09.334714:0: uart: Baud rate change done... > MESS:00:00:09.340188:0: gpioman: gpioman_get_pin_num: pin SDCARD_CONTROL_= POWER not defined > > (Yep: looks basically the same as before.) > > In a working modern-firmware-in-use context (uefi/ACPI via USB3 > SSD example), I see the following in the debug output during a > boot with modern firmware. Again note the "hnd" values vs. the > Device Tree memory. > > Read config.txt bytes 257 hnd 0x00000014 hash '149443376548b81e' > recover4.elf not found (6) > recovery.elf not found (6) > Read start4.elf bytes 2283936 hnd 0x000007e2 hash 'ddddf81164f250ad' > Read fixup4.dat bytes 5422 hnd 0x000008fa hash 'fdfbb390f4a2c93c' > > MESS:00:00:07.259636:0: Loading 'bcm2711-rpi-4-b.dtb' to 0x1f0000 size 0x= b99c > . . . > MESS:00:00:08.268417:0: brfs: File read: /mfs/sd/RPI_EFI.fd > MESS:00:00:08.270883:0: Loading 'RPI_EFI.fd' to 0x0 size 0x1f0000 > MESS:00:00:08.276708:0: No compatible kernel found > MESS:00:00:08.281210:0: Device tree loaded to 0x1f0000 (size 0xbd90) > > There is no overlap between the later Device Tree area and the > hnd values. > > There is an overlap between where RPI_EFI.fd is loaded and the > hnd values, but just at this later time frame, where the > overlaps might be less likely to matter. > > So far, I've not observed problems for this. It might suggest that > my hnd hypothesis is wrong. Or that it is late enough that the > overlaps do not matter any more. > > The messages continue in this case: > > MESS:00:00:08.287327:0: uart: Set PL011 baud rate to 103448.300000 Hz > MESS:00:00:08.296362:0: uart: Baud rate change done... > MESS:00:00:08.298385:0: uart: Baud rate change done... > MESS:00:00:08.303463:0: bfs_xhci_stop > MESS:00:00:08.306631:0: XHCI-STOP > MESS:00:00:08.311953:0: xHC ver: 256 HCS: 05000420 fc000031 00e70004 HCC:= 002841eb > NOTICE: BL31: v2.3():v2.3 > NOTICE: BL31: Built : 10:40:51, Apr 21 2020 > UEFI firmware (version UEFI Firmware v1.20 built at 14:10:14 on Sep 1 202= 0) > . . . . > > My memory is that armstub8-gic.bin currently requires the > 0x4000 for the start of the device tree. > > If the above turns out to be right, then it is likely > that older firmware also got overlaps with the hnd values > but happened to not fail for some not-always-guaranteed > reason. This is probably the strongest point against my > hypothesis. > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= 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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > > Mark Millard > marklmi at yahoo.com > ( dsl-only.net went > away in early 2018-Mar)
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