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Date:   Mon, 17 Feb 2020 11:50:04 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     LABBE Corentin <clabbe@...libre.com>,
        James Morse <james.morse@....com>
Cc:     nsaenzjulienne@...e.de, linux-kernel@...r.kernel.org,
        u-boot@...ts.denx.de, bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: RPI4: fail too boot with an initrd



On 17/02/2020 11:37, LABBE Corentin wrote:
> On Fri, Feb 14, 2020 at 06:15:27PM +0000, James Morse wrote:
>> Hi Corentin,
>>
>> On 14/02/2020 13:27, LABBE Corentin wrote:
>>> Since the inclusion of the "enable network support in RPi4 config" serie on uboot, I
>>> have started to work on adding the rpi4 in kernelCI.
>>> But I fail to succeed in using a kernel/dtb/ramdisk downloaded via tftp.
>>>
>>> Using booti I hit:
>>> [    0.000000] Linux version 5.6.0-rc1-next-20200212 (clabbe@...ld2-bionic-1804) (gcc version 7.4.1 20181213 [linaro-7.4-2019.02 revision 56ec6f6b99cc167ff0c2f8e1a2eed33b1edc85d4] (Linaro    GCC 7.4-2019.02)) #66 SMP PREEMPT Wed Feb 12 10:14:20 UTC 2020
>>> [    0.000000] Machine model: Raspberry Pi 4 Model B
>>> [    0.000000] earlycon: uart0 at MMIO32 0x00000000fe215040 (options '')
>>> [    0.000000] printk: bootconsole [uart0] enabled
>>> [    0.000000] efi: Getting EFI parameters from FDT:
>>> [    0.000000] efi: UEFI not found.
>>
>> So no EFI,
>>
>>> [    0.000000] OF: reserved mem: failed to allocate memory for node 'linux,cma'
>>
>> Out of memory.
>>
>>> [    0.000000] cma: Failed to reserve 32 MiB
>>> [    0.000000] Kernel panic - not syncing: Failed to allocate page table page
>>
>> Out of memory...
>>
>>> [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.6.0-rc1-next-20200212 #66
>>> [    0.000000] Hardware name: Raspberry Pi 4 Model B (DT)
>>> [    0.000000] Call trace:
>>> [    0.000000]  dump_backtrace+0x0/0x1a0
>>> [    0.000000]  show_stack+0x14/0x20
>>> [    0.000000]  dump_stack+0xbc/0x104
>>> [    0.000000]  panic+0x16c/0x37c
>>> [    0.000000]  early_pgtable_alloc+0x30/0xa0
>>
>> ... really early!
>>
>>> [    0.000000]  __create_pgd_mapping+0x36c/0x588
>>> [    0.000000]  map_kernel_segment+0x70/0xa4
>>> [    0.000000]  paging_init+0xf4/0x528
>>> [    0.000000]  setup_arch+0x250/0x5d8
>>> [    0.000000]  start_kernel+0x90/0x6d8
>>>
>>>  
>>> Since the same kernel boot with bootefi and that bootefi lack ramdisk address,
>>
>> Booting with EFI will cause linux to use the EFI memory map.
>>
>> Does your DT have a memory node? (or does it expect EFI to provide the information)
>>
>>
>>> I tried to add the address in the dtb via:
>>> fdt addr 0x02400000; fdt resize; fdt set /chosen linux,initrd-start 0x02700000; fdt set /chosen linux,initrd-end 0x10000000; bootefi 0x00080000 0x02400000
>>> But with that, I get:
>>> initrd not fully accessible via the linear mapping -- please check your bootloader ...
>>
>> So this one is an EFI boot, but you can't find where to put the initramfs such that the
>> kernel agrees its in memory.
>>
>> If you boot with 'efi=debug', linux will print the EFI memory map. Could you compare that
>> to where U-Boot thinks memory is?
>>
>> (it sounds like your DT memory node is missing, and your EFI memory map is surprisingly small)
> 
> Hello
> 
> Thanks for your advices.
> 
> In the dtb of mainline linux:
> 	/* Will be filled by the bootloader */
> 	memory@0 {
> 		device_type = "memory";
> 		reg = <0 0 0>;
> 	};
> 
> In uboot I have:
> static struct mm_region bcm2711_mem_map[] = {
>         {
>                 .virt = 0x00000000UL,
>                 .phys = 0x00000000UL,
>                 .size = 0xfe000000UL,
>                 .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
>                          PTE_BLOCK_INNER_SHARE
>         }, {
>                 .virt = 0xfc000000UL,
>                 .phys = 0xfc000000UL,
>                 .size = 0x03800000UL,
>                 .attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
>                          PTE_BLOCK_NON_SHARE |
>                          PTE_BLOCK_PXN | PTE_BLOCK_UXN
>         }, {
>                 /* List terminator */
>                 0,
>         }
> };
> But I dont know if uboot use that for filling the memory node.

No it doesn't. U-Boot uses the DT from the firmware and passes this to the
kernel. But it seems you pass instead your own device-tree to the kernel, so you
will need to update the memory node to show the available memory on you board.

Regards,
Matthias

> 
> 
> Booting the rpi4 with efi=debug give:
> EFI stub: Booting Linux Kernel...
> EFI stub: EFI_RNG_PROTOCOL unavailable, no randomness supplied
> EFI stub: Using DTB from configuration table
> EFI stub: Exiting boot services and installing virtual address map...
> [    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd083]
> [    0.000000] Linux version 5.6.0-rc1-next-20200214 (clabbe@...ld2-bionic-1804) (gcc version 7.4.1 20181213 [linaro-7.4-2019.02 revision 56ec6f6b99cc167ff0c2f8e1a2eed33b1edc85d4] (Linaro GCC 7.4-2019.02)) #70 SMP PREEMPT Fri Feb 14 10:54:54 UTC 2020
> [    0.000000] Machine model: Raspberry Pi 4 Model B
> [    0.000000] earlycon: uart0 at MMIO32 0x00000000fe215040 (options '')
> [    0.000000] printk: bootconsole [uart0] enabled
> [    0.000000] efi: Getting EFI parameters from FDT:
> [    0.000000] efi:   System Table: 0x000000003b365590
> [    0.000000] efi:   MemMap Address: 0x0000000038484040
> [    0.000000] efi:   MemMap Size: 0x00000410
> [    0.000000] efi:   MemMap Desc. Size: 0x00000028
> [    0.000000] efi:   MemMap Desc. Version: 0x00000001
> [    0.000000] efi: EFI v2.80 by Das U-Boot
> [    0.000000] efi:  SMBIOS=0x39f46000  MEMRESERVE=0x38487040 
> [    0.000000] efi: Processing EFI memory map:
> [    0.000000] efi:   0x000000000000-0x000000000fff [Reserved           |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000000001000-0x00000007ffff [Conventional Memory|   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000000080000-0x000001b3ffff [Loader Data        |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000001b40000-0x000007efffff [Conventional Memory|   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000007f00000-0x000007f08fff [Boot Data          |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000007f09000-0x0000381fffff [Conventional Memory|   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000038200000-0x0000383fffff [Loader Data        |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000038400000-0x00003846ffff [Conventional Memory|   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000038470000-0x00003847ffff [Loader Data        |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000038480000-0x000038483fff [Conventional Memory|   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000038484000-0x000038487fff [Loader Data        |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000038488000-0x000039f40fff [Loader Code        |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f41000-0x000039f44fff [Reserved           |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f45000-0x000039f45fff [Boot Data          |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f46000-0x000039f46fff [Runtime Data       |RUN|  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f47000-0x000039f48fff [Boot Data          |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f49000-0x000039f4cfff [Reserved           |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f4d000-0x000039f4efff [Boot Data          |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f4f000-0x000039f52fff [Reserved           |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f53000-0x000039f53fff [Runtime Data       |RUN|  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f54000-0x000039f54fff [Reserved           |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000039f55000-0x00003b35ffff [Loader Data        |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x00003b360000-0x00003b36ffff [Runtime Code       |RUN|  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x00003b370000-0x00003b3fffff [Loader Data        |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x000040000000-0x0000fbffffff [Boot Data          |   |  |  |  |  |  |  |  |   |WB|  |  |  ]
> [    0.000000] efi:   0x0000fe100000-0x0000fe100fff [Memory Mapped I/O  |RUN|  |  |  |  |  |  |  |   |  |  |  |  ]
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] initrd not fully accessible via the linear mapping -- please check your bootloader ...
> 
> Regards
> 
> _______________________________________________
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> linux-arm-kernel@...ts.infradead.org
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> 

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