run: bare-metal hello boots on cortex-a7, emmc 8GiB real GPT33

qemu/hello.c

@@ -0,0 +1,9 @@
+/* hello guest: proves qemu cortex-a7 pipeline on zern. virt UART0 0x09000000. */
+#define UART0 ((volatile unsigned int *)0x09000000)
+static void uart_putc(char c) { *UART0 = (unsigned int)c; }
+static void uart_puts(const char *s) { while (*s) uart_putc(*s++); }
+void main(void) {
+    uart_puts("SAIMAA-STUB: cortex-a7 alive, RAM ok\r\n");
+    uart_puts("SAIMAA-STUB: next -> PBL reads SBL1 LBA 90112\r\n");
+    while (1) { }
+}

qemu/run.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# run.sh — первый запуск: bare-metal hello на cortex-a7 + наш emmc.img на SDHCI.
+# Ожидаем UART-привет. Это проверка трубы, не загрузка Lumia.
+set -e
+cd "$(dirname "$0")/.."
+IMG=${IMG:-/tmp/emmc-test.img}
+arm-none-eabi-gcc -nostartfiles -nostdlib -mcpu=cortex-a7 -marm \
+  -Wl,-Ttext=0x40008000 -o /tmp/hello.elf qemu/start.S qemu/hello.c 2>/dev/null
+arm-none-eabi-objcopy -O binary /tmp/hello.elf /tmp/hello.bin
+echo "[run] guest built, starting qemu (10s timeout)..."
+timeout 10 qemu-system-arm -M virt -cpu cortex-a7 -m 1024 -nographic \
+  -kernel /tmp/hello.elf \
+  -drive file="$IMG",if=none,format=raw,id=emmc \
+  -device sdhci-pci -device sd-card,drive=emmc 2>&1 | head -10
+echo "[run] exit=$? (124 = timeout после вывода = OK для вечного цикла)"

qemu/start.S

@@ -0,0 +1,8 @@
+    .section .text
+    .global _start
+    .arm
+_start:
+    ldr sp, =0x40200000
+    bl main
+hang:
+    b hang