Hyperion Entertainment Message Boards

Darren wrote: Hello All,

commit d6a9996e84ac4beb7713e9485f4563e100a9b03e
powerpc/mm: vmalloc abstraction in preparation for radix

This commit introduced variables for some linux kernel addresses that had before been constants, unfortunately this stopped PaSemi PA6T systems(*) from booting as they call ioremap to map SoC registers before the mmu is initialised. The attached patch adds a hard-coded init of pci_io_base to the pas_init_early() function which which allows the kernel to boot normally.

The value will be harmlessly set again once pci starts up.

(*) At the moment this has only been tested on an AmigaOneX1000, but I expect PaSemi reference systems to have been affected in the same way.

Kind regards
Darren

diff --git a/arch/powerpc/platforms/pasemi/setup.c b/arch/powerpc/platforms/pasemi/setup.c
index d71b2c7..6b8d2ab 100644
--- a/arch/powerpc/platforms/pasemi/setup.c
+++ b/arch/powerpc/platforms/pasemi/setup.c
@@ -61,6 +61,7 @@ static struct mce_regs mce_regs[MAX_MCE_REGS];
 static int num_mce_regs;
 static int nmi_virq = NO_IRQ;
 
+extern unsigned long pci_io_base;
 
 static void pas_restart(char *cmd)
 {
@@ -341,6 +342,10 @@ out:
 
 static void __init pas_init_early(void)
 {
+	/* Initialise the IO pointer so we don't crash on boot */
+
+	pci_io_base = (H_KERN_VIRT_START + (H_KERN_VIRT_SIZE >> 1));
+
 	iommu_init_early_pasemi();
 }

xeno74 wrote:Hi Kilaueabart & Mechanic,

I cross compiled the RC5 with Darren's bootfix on my x86_64 Ubuntu server 14.04 today.

Download: vmlinux-4.7-rc5-AmigaONE_X1000.tar.gz

Could you please test the RC5? I don't know if it boots because I have only my x86 Server for compiling here. -PLEASE-

Thanks in advance,

Christian

daz wrote: It boots fine, I am writing this from my MintPPC install that I have booted with your kernel.

I'll carry on trying to narrow down which part of the init code is at fault.

Regards
Darren

xeno74 wrote:Hi Kilaueabart & Mechanic,
...
Could you please test the RC5? I don't know if it boots because I have only my x86 Server for compiling here. -PLEASE-

kilaueabart wrote:

xeno74 wrote:Hi Kilaueabart & Mechanic,
...
Could you please test the RC5? I don't know if it boots because I have only my x86 Server for compiling here. -PLEASE-

It failed on my X1000 twice. First I downloaded while booted into MATE with the previous 4.7 and de-archived directly into CF CARD, replacing that 4.7 RC4, and rebooted.
"Failed ... not ELF ..."

I just let OS4 come up and recopied the archive into RAM:, dearchived it there, and copied vmlinux-4.7 to the CF CARD, but trying to boot MATE with it brought the same "not ELF" error message.

So right now, I'm back to 4.1.27.

Here's what I have on the CF CARD:

4.1.25_A-EON_AmigaONE_X1000_Nemo 1 item
4.6.3_A-EON_AmigaONE_X1000_Nemo 12 items
vmlinux-4.7-rc3-AmigaONE_X1000 5 items
vmlinux-4.7-rc5-AmigaONE_X1000 4 items
initrd.img-4.1.25_A-EON_AmigaONE_X1000_Nemo 3.1 MB
rc3.7 30.7 MB executable
vmlinux-4.1 24.8 MB executable
vmlinux-4.6 30.5 MB executable
vmlinux-4.7 30.7 MB executable
vmlinux-4.7r 30/7 MB executable

No hint that there is anything wrong with 4.7 here.