Heinrich Schuchardt xypron

## Screenshot.png

      
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                xypron
                / Screenshot.png
            
            
              Last active
              July 31, 2026 07:50
            
              
                U-Boot: incorrect graphics output for efi-x86_app64_defconfig
              
          
## pow.c
// SPDX-License-Identifier: MIT
// gcc -O2 -static -s -o pow.shutdown pow.c
// sudo cp pow /usr/lib/systemd/system-shutdown/pow.shutdown
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <linux/reboot.h>
#include <sys/syscall.h>

## linux-keymap.c
// SPDX-License-Identifier: MIT
/**
 * The layout of Google crosswire keyboards (compatible = "google,cros-ec-keyb")
 * are described in the device-tree by the linux,keymap property.
 *
 * The program below shows how to translate the property to human readable form.
 */
#include <stdio.h>

struct keydef {

## create_risc-v_vm_with_libvirt_on_jammy.md

      
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                xypron
                / create_risc-v_vm_with_libvirt_on_jammy.md
            
            
              Created
              March 24, 2026 14:33
            
          
    Create a x86 VM with multipass
multipass launch \
  -n jammy 22.04 \
  --cpus 4 \
  --disk 16G \
  --memory 16G
multipass shell jammy


## gist:83c27e97d2d5dfe531702a7aa79cffe5
The following GUIDs are present in /EFI/BOOT/BOOTAA64.efi of memtest86-usb.zip
(https://www.memtest86.com/downloads/memtest86-usb.zip)

D2 E8 A4 EB  58 38 EC 41  A2 81 26 47  BA 96 60 D0

#define EFI_DEBUGPORT_PROTOCOL_GUID \
  {0xEBA4E8D2,0x3858,0x41EC,\
    {0xA2,0x81,0x26,0x47,0xBA,0x96,0x60,0xD0}}

DE A9 42 90  DC 23 38 4A  96 FB 7A DE  D0 80 51 6A

## Makefile
#!/usr/bin/make -f
# SPDX-License-Identifier: MIT

UBOOT_VERSION=eab538b697011b866aba64938ef045e67fa08dc2
OPENSBI_VERSION=EIC7X-2024.11
NSIGN_VERSION=74e7c69b812923f68ef3eeb0c1cbbee90f80b566

all:
	make uboot
	make sbi

## DeepComputing_Roma_II_UART.jpg

      
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                xypron
                / DeepComputing_Roma_II_UART.jpg
            
            
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              November 21, 2024 16:18
            
              
                Roma II laptop UART
              
          
## Milk-V_Mars_Boot_Source_Selection_SD_card.jpg

      
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                xypron
                / Milk-V_Mars_Boot_Source_Selection_SD_card.jpg
            
            
              Last active
              March 8, 2024 02:22
            
              
                Boot select switches on Milk-V Mars
              
          
## gist:43b58aac1232e73b8eff749fbcc3b4b3
#**************************************************************************
#   Copyright (C) 2015-2020 by Microchip Technology Inc.                  *
#   http://www.microchip.com/support                                      *
#                                                                         *
#   This program is free software; you can redistribute it and/or modify  *
#   it under the terms of the GNU General Public License as published by  *
#   the Free Software Foundation; either version 2 of the License, or     *
#   (at your option) any later version.                                   *
#                                                                         *
#   This program is distributed in the hope that it will be useful,       *

## gist:2202c7b86cdd149d70c59d353e64e76e
Device-tree in memory

$47 = 0xff72efc9 "clock-f\001"
(gdb) x/16w 0xff72efa0
0xff72efa0:     0x69006b73      0x7265746e      0x74707572      0x70616d2d
0xff72efb0:     0x72777000      0x672d6e65      0x736f6970      0x73657200
0xff72efc0:     0x672d7465      0x736f6970      0x6f6c6300      0x662d6b63
0xff72efd0:   >>0x00000001<<    0x79636e65      0x66697300      0x2c657669
0xff72efe0:     0x2d726464      0x61726170      0x6300736d      0x6b636f6c
0xff72eff0:     0x74756f2d      0x2d747570      0x656d616e      0x756d0073
	// SPDX-License-Identifier: MIT
	// gcc -O2 -static -s -o pow.shutdown pow.c
	// sudo cp pow /usr/lib/systemd/system-shutdown/pow.shutdown
	#include <errno.h>
	#include <fcntl.h>
	#include <string.h>
	#include <stdio.h>
	#include <unistd.h>
	#include <linux/reboot.h>
	#include <sys/syscall.h>
	// SPDX-License-Identifier: MIT
	/**
	* The layout of Google crosswire keyboards (compatible = "google,cros-ec-keyb")
	* are described in the device-tree by the linux,keymap property.
	*
	* The program below shows how to translate the property to human readable form.
	*/
	#include <stdio.h>

	struct keydef {
	The following GUIDs are present in /EFI/BOOT/BOOTAA64.efi of memtest86-usb.zip
	(https://www.memtest86.com/downloads/memtest86-usb.zip)

	D2 E8 A4 EB 58 38 EC 41 A2 81 26 47 BA 96 60 D0

	#define EFI_DEBUGPORT_PROTOCOL_GUID \
	{0xEBA4E8D2,0x3858,0x41EC,\
	{0xA2,0x81,0x26,0x47,0xBA,0x96,0x60,0xD0}}

	DE A9 42 90 DC 23 38 4A 96 FB 7A DE D0 80 51 6A
	#!/usr/bin/make -f
	# SPDX-License-Identifier: MIT

	UBOOT_VERSION=eab538b697011b866aba64938ef045e67fa08dc2
	OPENSBI_VERSION=EIC7X-2024.11
	NSIGN_VERSION=74e7c69b812923f68ef3eeb0c1cbbee90f80b566

	all:
	make uboot
	make sbi
	#**************************************************************************
	# Copyright (C) 2015-2020 by Microchip Technology Inc. *
	# http://www.microchip.com/support *
	# *
	# This program is free software; you can redistribute it and/or modify *
	# it under the terms of the GNU General Public License as published by *
	# the Free Software Foundation; either version 2 of the License, or *
	# (at your option) any later version. *
	# *
	# This program is distributed in the hope that it will be useful, *
	Device-tree in memory

	$47 = 0xff72efc9 "clock-f\001"
	(gdb) x/16w 0xff72efa0
	0xff72efa0: 0x69006b73 0x7265746e 0x74707572 0x70616d2d
	0xff72efb0: 0x72777000 0x672d6e65 0x736f6970 0x73657200
	0xff72efc0: 0x672d7465 0x736f6970 0x6f6c6300 0x662d6b63
	0xff72efd0: >>0x00000001<< 0x79636e65 0x66697300 0x2c657669
	0xff72efe0: 0x2d726464 0x61726170 0x6300736d 0x6b636f6c
	0xff72eff0: 0x74756f2d 0x2d747570 0x656d616e 0x756d0073