gem5 fs: pass earlycon to show printks console much earlier in boot!

Author: cirosantilli

run

@@ -611,7 +611,7 @@ Extra options to append at the end of the emulator command line.
                         if self.env['kvm']:
                             cmd.extend(['--cpu-type', 'X86KvmCPU', LF])
                         if not self.env['baremetal']:
-                            cmd.extend(['--command-line', 'earlyprintk={} lpj=7999923 root=/dev/sda {}'.format(console, kernel_cli), LF])
+                            cmd.extend(['--command-line', 'earlycon={} earlyprintk={} lpj=7999923 root=/dev/sda {}'.format(console, console, kernel_cli), LF])
                     elif self.env['is_arm']:
                         if self.env['kvm']:
                             cmd.extend(['--cpu-type', 'ArmV8KvmCPU', LF])
@@ -627,7 +627,7 @@ Extra options to append at the end of the emulator command line.
                                 '--command-line',
                                 # TODO why is it mandatory to pass mem= here? Not true for QEMU.
                                 # Anything smaller than physical blows up as expected, but why can't it auto-detect the right value?
-                                'earlyprintk=pl011,0x1c090000 lpj=19988480 rw loglevel=8 mem={} root=/dev/sda {}'.format(memory, kernel_cli), LF
+                                'earlycon=pl011,0x1c090000 earlyprintk=pl011,0x1c090000 lpj=19988480 rw loglevel=8 mem={} root=/dev/sda {}'.format(memory, kernel_cli), LF
                             ])
                             cmd.extend(['--param', 'system.workload.panic_on_panic = True', LF])
                         dtb = None