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Sender: Guenter Roeck <groeck7@gmail.com>
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Date:   Mon, 2 May 2022 13:35:11 -0700
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To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Robert Jarzmik <robert.jarzmik@free.fr>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
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From:   Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH v2 00/48] ARM: PXA multiplatform support
In-Reply-To: <CAK8P3a0ogn1wgPBDHkT=Fb8ufA+y8Ax1Qov2-vRXfC08QqnrQA@mail.gmail.com>
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On 5/2/22 12:21, Arnd Bergmann wrote:
> On Mon, May 2, 2022 at 6:26 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> With v5.18-rc1-49-gcb813018b5c1, I still get:
>>
>> [    0.797668] RAMDISK: Couldn't find valid RAM disk image starting at 0.
>> [    0.805262] /dev/root: Can't open blockdev
>> [    0.805487] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
>> [    0.805674] Please append a correct "root=" boot option; here are the available partitions:
>>
>> when trying to boot z2 from initrd.
>>
>> The other problems are gone.
> 
> Ok, progress!
> 
> What is your qemu command line? I see that z2 has no pcmcia device, so
> I tried booting
> from MMC, but this already fails with 5.18-rc1 without any of my
> patches, giving me
> 
> [    0.697481] Creating 3 MTD partitions on "physmap-flash":
> [    0.698161] 0x000000000000-0x000000040000 : "U-Boot Bootloader"
> [    0.702815] 0x000000040000-0x000000060000 : "U-Boot Environment"
> [    0.706541] 0x000000060000-0x000000800000 : "Flash"
> [    0.718066] pxa2xx-mci pxa2xx-mci.0: incomplete constraints, dummy
> supplies not allowed
> [    0.718501] pxa2xx-mci pxa2xx-mci.0: incomplete constraints, dummy
> supplies not allowed
> 

To boot from initrd:

qemu-system-arm -M z2 -kernel \
      arch/arm/boot/zImage -no-reboot -initrd \
      rootfs-armv5.cpio --append \
      "panic=-1 slub_debug=FZPUA rdinit=/sbin/init console=ttyS0" -nographic \
      -monitor null -serial stdio

where rootfs-armv5.cpio is from my repository at github.com.

https://github.com/groeck/linux-build-test/blob/master/rootfs/arm/rootfs-armv5.cpio.gz

> Do  you have MMC or some other rootfs working without my patch series?
> 

I can boot z2 from mmc and flash, but I have a number of configuration
flags enabled on top of pxa_defconfig. That also works with your latest patch
series. See
https://kerneltests.org/builders/qemu-arm-testing/builds/75/steps/qemubuildcommand/logs/stdio

     # Always enable ...
     enable_config "${defconfig}" CONFIG_DEVTMPFS CONFIG_DEVTMPFS_MOUNT CONFIG_BLK_DEV_INITRD
     # Options needed to be built into the kernel for device support
     # on pxa devices
     # MTD, squashfs
     enable_config_cond "${defconfig}" CONFIG_MTD_BLOCK CONFIG_MTD_PXA2XX CONFIG_SQUASHFS
     # MMC
     enable_config_cond "${defconfig}" CONFIG_MMC_BLOCK CONFIG_MMC_PXA
     # PCMCIA
     enable_config_cond "${defconfig}" CONFIG_ATA CONFIG_BLK_DEV_SD CONFIG_PCCARD
     enable_config_cond "${defconfig}" CONFIG_PCMCIA CONFIG_PATA_PCMCIA CONFIG_PCMCIA_PXA2XX
     # USB
     enable_config_cond "${defconfig}" CONFIG_USB CONFIG_USB_STORAGE CONFIG_USB_OHCI_HCD CONFIG_USB_OHCI_HCD_PXA27X

Hope this helps,
Guenter