[J-core] working on SH-2 emulator.

[Rob Landley]

On 09/06/2016 03:40 AM, BGB wrote:
> On 9/6/2016 2:26 AM, D. Jeff Dionne wrote:
>> The driver does exist...  here is a print of my boot just a few min ago:
>>
>> Open vmlinux OK
>> Use bootloader's DTB
>> RUN program
>> Linux version 4.6.0-00044-g127f81a-dirty (jeff at VirtualSuSE) (gcc
>> version 5.3.0 (GCC) ) #2 SMP Sun Sep 4 07:28:34 EDT 2016
>> Boot params:
>> ... MOUNT_ROOT_RDONLY - 00000001
>> ... RAMDISK_FLAGS     - 00000000
>> ... ORIG_ROOT_DEV     - 00000200
>> ... LOADER_TYPE       - 00000001
>> ... INITRD_START      - 00000000
>> ... INITRD_SIZE       - 00000000
>> earlycon: uartlite_a0 at MMIO 0xabcd0100 (options '')
>> bootconsole [uartlite_a0] enabled
>> Booting machvec: devicetree
>>
>> The relevant lines in .config are:
>>
>> #
>> # Serial drivers
>> #
>> CONFIG_SERIAL_EARLYCON=y
>> # CONFIG_SERIAL_8250 is not set
>>
>> #
>> # Non-8250 serial port support
>> #
>> # CONFIG_SERIAL_MAX3100 is not set
>> # CONFIG_SERIAL_MAX310X is not set
>> CONFIG_SERIAL_UARTLITE=y
>> CONFIG_SERIAL_UARTLITE_CONSOLE=y
>> # CONFIG_SERIAL_SH_SCI is not set
>> CONFIG_SERIAL_CORE=y
>> CONFIG_SERIAL_CORE_CONSOLE=y
> 
> good to know. I am working on getting the kernel rebuilt (ex: trying to
> use Aboriginal).
> this is pretty slow and it didn't work the first attempt, so trying again.
> if it doesn't work, I might try "sh2elf" rather than "sh2eb".
> 
> as noted, I did add CAS, SHAD, and SHLD, since in this case there wasn't
> really all that much reason not to.

Oh, the build kind of expects a root filesystem in initramfs, which
means you need a cpio archive or directory to point
CONFIG_INITRAMFS_SOURCE at, which means you might want to look at:

 https://github.com/j-core/mkroot

(Sorry, I really need to write this up properly for the web page. _And_
I need to get a new aboriginal linux release out using Rich's toolchain
and an updated kernel version.)

Rob