[fedora-arm] aarch64 kernel 4.15.3-300 & 4.15.4-300 SError Interrupt - panic on bootup - macchiatobin (Armada8040)

[Gabor Samu]

Hello,
I have a macchiatobin Armada 8040 based system with an old AMD Firestream 9250 video card
booting via UEFI EDKII.  The system has worked quite well up until recently.  With kernels
4.15.3-300 and 4.15.4-300 the systempanics on bootup starting with error: 

 
[    4.134847] SError Interrupt on CPU1, code 0xbf000000 -- SError                        
                             [    4.134851] CPU: 1 PID: 334 Comm: systemd-udevd Not
tainted 4.15.4-300.fc27.aarch64 #1                               [    4.134852] Hardware
name: Marvell Armada 8040 MacchiatoBin/Armada 8040 MacchiatoBin, BIOS EDK II Oct 10 2017  
    [    4.134854] pstate: 80400005 (Nzcv daif +PAN -UAO)                                 
                                 [    4.134996] pc : r100_io_wreg+0x68/0x80 [radeon]     
                                                               [    4.135123] lr :
cail_ioreg_write+0x38/0x48 [radeon]                                                       
         [    4.135123] sp : ffff00001247b4f0                                            
                                       [    4.135125] x29: ffff00001247b4f0 x28:
000000000000b112                                                              [   
4.135127] x27: 000000000000b111 x26: 0000000000000020                                    
                         [    4.135129] x25: 00000000ffffffff x24: ffffb19668d53900      
                                                       [    4.135131] x23:
0000000000000002 x22: 0000000000008001                                                    
         [    4.135132] x21: 0000000000008001 x20: 0000000000000034                      
                                       [    4.135134] x19: ffffb196671ec000 x18:
0000000000000018                                                              [   
4.135135] x17: 0000000000000000 x16: 0000000000000000                                    
                         [    4.135137] x15: ffffffffffffffff x14: ffffffffffff0000      
                                                       [    4.135138] x13:
ffffffffffffffff x12: ffff1b4a9ce35000                                                    
         [    4.135140] x11: 0000000000000000 x10: ffff1b4a9cfe3000                      
                                       [    4.135141] x9 : 0000000000000000 x8 :
ffffb19667263e80                                                              [   
4.135143] x7 : ffff01f28ed85618 x6 : ffff01f28ed85150                                    
                         [    4.135144] x5 : 000000000000b5bf x4 : 0000000000000002      
                                                       [    4.135146] x3 :
ffff01f28ec847d0 x2 : 0000000000000100                                                    
         [    4.135147] x1 : 0000000000000034 x0 : ffff7dfffee01034                      
                                       [    4.135150] Kernel panic - not syncing:
Asynchronous SError Interrupt                                                
Full boot log is at: EFI stub: Booting Linux Kernel... EFI stub: Using DTB from
configuration table - Pastebin.com

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EFI stub: Booting Linux Kernel... EFI stub: Using DTB from configuratio...


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