Raspberry Pi 400

*unplug SDIODriver

Thought so, but I can’t type when it hangs?

Do you have another Pi? You could put the card in there, unplug SDIODriver then transplant the card back into the 400.

That’s assuming that the CMOS settings get saved with SDIODriver unplugged!

Edit: Of course it’s using USB so there’s no card involved!

I did it on another Pi. Set the unplug then save or copy the CMOS file to the Pi 400 pen. Then rmreinit SDIODriver on the other Pi.

Applying the required unplugging of the SDIODriver module which stalls as the RPi400 starts is a fiddly business.

For the RPi400 ONLY, OS5.28 or OS5.29, a CMOS file with SDIODriver unplugged is here. Withdrawn, the ROM has been fixed.

It is configured as below.

*unplug
Unplugged modules are:
SDIODriver
*
*status FileSystem
FileSystem SCSI
*status SCSIFSDrive
SCSIFSDrive 1
*

The RPi400 should startup and the boot arrangements can be ammended as required.

I am using a two USB pen solution, one is Fat32FS with the firmware etc. and the other SCSI with RISC OS.

By default CMOS is only saved to the SD card. To save it to a pen use a SaveCMOS command in an Obey file in a PostDesk directory in Choices.Boot as described here in the The “boot from USB” issue section

Yeah definitely a bit fiddly. I got it booted though as I used my old Pi 3 and unplugged the module, just problems with !Boot. Think I will wait until the team manage to make a version for the 400, shouldn’t be too long though as it’s semi working.

Does anyone at ROOL know of the SDIODriver problem?
I can’t see it in bug tracker or in Pi 4 Port status.
I don’t know how frequently anyone from ROOL reads the Forum so I’ve added it to bug tracker.

I can’t help feeling I should have thought of this earlier. I have just tried a normal, partitioned, Pi SD card in a single slot USB reader in the RPi400 and it just worked, subject to SDIODriver being unplugged.

I have Pi ROM updates to add a Platform name for the RPi400.

--- ADFS::ROOL.$.ROOL.RPi400.BCM2835.RiscOS.Sources.HAL.HAL_BCM2835.hdr.BCM2835_00	2020-11-05 14:27:58.0 +0000
+++ ADFS::ROOL.$.ROOL.RPi400.BCM2835.RiscOS.Sources.HAL.HAL_BCM2835.hdr.BCM2835	2020-11-05 14:27:58.0 +0000
@@ -364,2 +364,3 @@
 BoardRevision_Model_B4      *  17 :SHL: BoardRevision_Model_Shift
+BoardRevision_Model_B400    *  19 :SHL: BoardRevision_Model_Shift
 BoardRevision_Rev_Shift     *   0

--- ADFS::ROOL.$.ROOL.RPi400.BCM2835.RiscOS.Sources.HAL.HAL_BCM2835.s.GPIO_00	2020-11-05 14:28:38.0 +0000
+++ ADFS::ROOL.$.ROOL.RPi400.BCM2835.RiscOS.Sources.HAL.HAL_BCM2835.s.GPIO	2020-11-05 14:28:38.0 +0000
@@ -218,2 +218,3 @@
 GPIORevision_RaspberryPi_Mk4_B   #       1 ; Model Pi 4 B
+GPIORevision_RaspberryPi_Mk400   #       1 ; Model Pi 400
 GPIORevision_RaspberryPi_Max     #       0
@@ -235,2 +236,3 @@
 Name_B_4 = "Raspberry Pi 4 Model B", 0
+Name_B_400 = "Raspberry Pi 400", 0
 Name_Unknown = "Raspberry Pi Unknown", 0
@@ -254,2 +256,3 @@
         DCD     Name_B_4
+        DCD     Name_B_400
         ASSERT  (.-GPIO_Board_Names_Table) :SHR: 2 = GPIORevision_RaspberryPi_Max
@@ -333,2 +336,4 @@
         DCD     GPIORevision_RaspberryPi_Mk4_B
+        DCD     BoardRevision_Mem_4G+BoardRevision_Model_B400+(0:SHL:BoardRevision_Rev_Shift)
+        DCD     GPIORevision_RaspberryPi_Mk400
         DCD     &FF
@@ -963,2 +968,4 @@
         DCD     2_00000000000000000000000000000000
+        DCD     2_00001111111111111111111111111111      ; 400
+        DCD     2_00000000000000000000000000000000
         ASSERT  (.-GPIOFreeToUse) :SHR: 3 = GPIORevision_RaspberryPi_Max

I have generated an updated rom (update 13) which works on the Pi 400. It is simply today’s rom source with the change to make Help2 work (which is on its way to being merged but not quite there yet) and a rather crude fudge to produce a rom that works on the Pi400 (but not on the Pi 4) by substituting the Pi 400 revision code (19) for the Pi4 revision code (17):

Changing line 364 in
BCM2835.RiscOS.Sources.HAL.HAL_BCM2835.hdr.BCM2835
from
BoardRevision_Model_B4 * 17 :SHL: BoardRevision_Model_Shift
to
BoardRevision_Model_B4 * 19 :SHL: BoardRevision_Model_Shift
makes a rom that will work on the Pi400, thus SDIODriver and the SD card filing system now works correctly on the Pi400. The GPIO module is not working yet but I’ll leave that to someone else…

In the update is also the 5.28 rom which works on the Pi 4.

I have also updated the benchmarks to include Pi 400.

Yeah, there’s bit in s.SDIO which identifies new boards on a whitelist basis. Arguably not the best way to do things, since most of the time, a new board is similar or identical in operation to the previous generation. With that fixed, the board boots correctly. I’ll create a merge request on GitLab for it.

I have Pi ROM updates to add a Platform name for the RPi400.

You also need a change to SDIO where it tests for a Pi 4 and looks for BoardRevision_Model_B4 but not yet for BoardRevision_Model_B400

You may as well add in the Compute Module 4 which has a single bank of GPIOs GPIO 0 to GPIO 27. Note that the RaspberryPi CM3+ had 54 GPIOs with 3 seprate voltage banks. In RaspberryPi CM4 there is only one GPIO bank with 28 GPIOs available. The other GPIOs were removed as they are used for the onboard WiFi/Bluetooth and Ethernet (according to this post).

You also need a change to SDIO where it tests for a Pi 4 and looks for BoardRevision_Model_B4 but not yet for BoardRevision_Model_B400

Brilliant. I added a bit. The ROM works on the RPi4 and RPi400.

--- ADFS::ROOL.$.ROOL.RPi400.BCM2835.RiscOS.Sources.HAL.HAL_BCM2835.s.SDIO_00	2020-11-05 17:41:15.0 +0000
+++ ADFS::ROOL.$.ROOL.RPi400.BCM2835.RiscOS.Sources.HAL.HAL_BCM2835.s.SDIO	2020-11-05 17:41:15.0 +0000
@@ -472,2 +472,6 @@
         STREQ   a1, SDHCIDevice + HALDevice_Activate
+        TEQ     a3, #BoardRevision_Model_B400
+        ADREQ   a1, Activate_B4
+        STREQ   a1, SDHCIDevice + HALDevice_Activate
+

Thanks all.

The RPi400 is booting from an SD card in the SD socket and no unplugs.

Running stable so far at 2.35GHz.

Graphics Resoloution: 1920x1080, 16M colours

Test                                                   Benchmark
Processor - Looped instructions (cache)                  5840415    3283%
Memory - Multiple register transfer                        84175   51959%
Rectangle Copy - Graphics acceleration test                 1339     553%
Icon Plotting - 16 colour sprite with mask                 53429    2671%
Draw Path - Stroke narrow line                             14420     924%
Draw Fill - Plot filled shape                              10803     740%
Draw Render - Render draw file                             16135    1780%
HD Read - Block load 8MB file                              31507    1056%
HD Write - Block save 8MB file                             28998     953%
FS Read - Byte stream file in                                506     244%
FS Write - Byte stream file out                              559     291%

Running stable so far at 2.35GHz.

I thought 2.2Ghz was the maximum? Incredible to have this performance on a £65 all-in-one RISC OS-compatible computer.

Very exciting indeed… still waiting for mine to arrive though… :(

I thought 2.2Ghz was the maximum?

It does start up at 2.4GHz but starts getting random lockups.

Very exciting indeed… still waiting for mine to arrive though… :(

Me too – ordered on 2nd, email to say shipped (first class Royal Mail) on the 4th but no sign of it yet.

Mine arrived today, I order it on Wednesday from Pimoroni Ltd, the delivery time was 49 hours to my door. (Not bad because I’m located in Iceland)
It took me one hour to get it booted in RISCOS using the updated ROM from Chris but I was not able to use my existing SD card from my Pi4, got some boot error, therefore I used new SD card and downloaded Nightly Beta HardDisc4 image from ROOL.
It is very quick to start and looked very good until I tried to use NetSurf. I always got an error and it shutdown when I tried to load a web-pages. I will use the weekend to work on the NetSurf problem. The CPU temp was always below 40C

Working fine here with that ROM you posted on your site Chris, so thanks. Definitely been the best experience I have had using RISC OS on the Pi, I have overclocked to 2.2ghz and it’s fast. Looking forward to a more fully featured web browser though but NetSurf does the job (somewhat)

still waiting for mine to arrive though…

Maybe the delivery vehicle has a Ferrari engine?
It will just take longer to get to you :)

When it does the latest ROM release will no doubt “just work”

Maybe the delivery vehicle has a Ferrari engine?

That would help but who’s going to pay for the delivery costs???? :D

It will just take longer to get to you :)

It’s finally arrived!!!!! :D
Big shot out to the CJE gang, thanks guys!! Just in time for the (RISC OS) weekend!!! (and with this one we are a 3 epic RO weekends in a row, I am defo getting spoiled!) :D

When it does the latest ROM release will no doubt “just work”

Then less fun for me, but still cool, tons of other stuff to try out!

obviously I’ll fire it up as soon as I stop working today, not going to wait till tomorrow!

Are ROOL going to be pragmatic and do an updated 5.28 stable release ASAP that also works on the Pi400?

Otherwise we will be answering questions from confused newcomers wondering why it doesn’t boot for the next two years until 5.30 comes out :-(

ROM builds are still broken and significantly updates for the RPi400 are in git but not yet merged.

An OS5.29 ROM build for all Pi’s is here, it has Ben’s updates. It is running here on both the RPi4 and RPi400. The zip also contains the required firmware.

It’s finally arrived!!!!! :D

A sort of early Xmas present. Have fun. Lots of new coding.
And David is even providing an interim build so RO works right now – definitely Xmas for you.