sbl bringup: stublets, slots, maze, ffu-ref, b10 chain, docs

2026-09-07 13:10:38 +00:00
parent 11facdfb45
commit c7e95b4194
6 changed files with 430 additions and 4 deletions
@@ -0,0 +1,65 @@
+import struct
+
+M = '/root/qemu-src/qemu-8.2.2/hw/arm/saimaa.c'
+src = open(M).read()
+
+start = src.find('        /* Boot scaffolding for SBL1 BringUp')
+assert start > 0, 'scaffold start not found'
+end_marker = 'printf("saimaa: SBL1 %s loaded'
+end = src.find(end_marker, start)
+assert end > 0, 'scaffold end not found'
+line_start = src.rfind('\n', 0, end) + 1
+
+blob = open('/tmp/stubs3.bin', 'rb').read()
+print('stub blob len', len(blob))
+c_array = ', '.join('0x%02x' % b for b in blob)
+
+S10_A = '0x08062001'
+S2 = '0x08062013'
+S10_B = '0x08062021'
+S6_A = '0x08062033'
+
+new_block = '''        /* Boot scaffolding for SBL1 BringUp (WIP stub-driven PBL):
+         * pop-compensation stublets at 0x08062000 pin sp and route onward,
+         * so repeated pops always hit valid slots. */
+        {
+            static const unsigned char stub_blob[] = { %s };
+            uint32_t magic = 0x00000000; /* IMEM poll spins WHILE equal */
+            uint32_t S = 0x08062100, STUB = 0x08062120;
+            uint32_t w;
+            uint16_t h0 = 0x2000, h1 = 0x4770; /* movs r0,#0; bx lr */
+            size_t k;
+            uint32_t v;
+            for (k = 0; k < sizeof(stub_blob); k += 4) {
+                uint32_t word;
+                __builtin_memcpy(&word, &stub_blob[k], 4);
+                cpu_physical_memory_write(0x08062000 + k, &word, 4);
+            }
+            /* pointer maze in owned RAM for SBL1 struct chains */
+            w = S + 8;
+            cpu_physical_memory_write(S, &w, 4);
+            cpu_physical_memory_write(S + 8, &STUB, 4);
+            cpu_physical_memory_write(STUB, &h0, 2);
+            cpu_physical_memory_write(STUB + 2, &h1, 2);
+            cpu_physical_memory_write(0x087c29d18, &S, 4);
+            cpu_physical_memory_write(0x08050b28, &S, 4);
+            cpu_physical_memory_write(0x08070000, &S, 4);
+            /* pop-site slots -> stublets (sp values from cpu traces) */
+            v = %s; /* S1 pop10 */
+            cpu_physical_memory_write(0x085FFF14, &v, 4);
+            v = %s; /* S2 pop2 */
+            cpu_physical_memory_write(0x085FFF1C, &v, 4);
+            v = %s; /* S3 pop10 */
+            cpu_physical_memory_write(0x085FFF44, &v, 4);
+            cpu_physical_memory_write(0x085FFF7C, &v, 4);
+            v = %s; /* S4 pop6 (stublet chains S5) */
+            cpu_physical_memory_write(0x085FFF34, &v, 4);
+            cpu_physical_memory_write(0x08600944, &magic, 4);
+            printf("saimaa: stub-scaffold live\\n");
+        }
+        {
+''' % (c_array, S10_A, S2, S10_B, S6_A)
+
+src = src[:start] + new_block + src[line_start:]
+open(M, 'w').write(src)
+print('CANONICAL SCAFFOLD v2 OK')