Allow custom sized SD cards to be used by QEMU

Makefile

@@ -8,6 +8,7 @@ i386:
 
 	tar xf qemu-5.2.0.tar.xz
 	patch -Np1 -d qemu-5.2.0 < qemu-5.2.0-reduce_default_code_gen_buffer.patch
+	patch -Np1 -d qemu-5.2.0 < qemu-5.2.0-allow_custom_size_sd.patch
 	cd qemu-5.2.0 && ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var --target-list=i386-softmmu,i386-linux-user
 	$(MAKE) -C qemu-5.2.0
 	$(MAKE) -C qemu-5.2.0 check
@@ -29,6 +30,7 @@ x86_64:
 
 	tar xf qemu-5.2.0.tar.xz
 	patch -Np1 -d qemu-5.2.0 < qemu-5.2.0-reduce_default_code_gen_buffer.patch
+	patch -Np1 -d qemu-5.2.0 < qemu-5.2.0-allow_custom_size_sd.patch
 	cd qemu-5.2.0 && ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var --target-list=x86_64-softmmu,x86_64-linux-user
 	$(MAKE) -C qemu-5.2.0
 	$(MAKE) -C qemu-5.2.0 check
@@ -54,6 +56,7 @@ arm:
 
 	tar xf qemu-5.2.0.tar.xz
 	patch -Np1 -d qemu-5.2.0 < qemu-5.2.0-reduce_default_code_gen_buffer.patch
+	patch -Np1 -d qemu-5.2.0 < qemu-5.2.0-allow_custom_size_sd.patch
 	cd qemu-5.2.0 && ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var --target-list=arm-softmmu,arm-linux-user,armeb-linux-user
 	$(MAKE) -C qemu-5.2.0
 	$(MAKE) -C qemu-5.2.0 check
@@ -79,6 +82,7 @@ aarch64:
 
 	tar xf qemu-5.2.0.tar.xz
 	patch -Np1 -d qemu-5.2.0 < qemu-5.2.0-reduce_default_code_gen_buffer.patch
+	patch -Np1 -d qemu-5.2.0 < qemu-5.2.0-allow_custom_size_sd.patch
 	cd qemu-5.2.0 && ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var --target-list=aarch64-softmmu,aarch64-linux-user,aarch64_be-linux-user
 	$(MAKE) -C qemu-5.2.0
 	$(MAKE) -C qemu-5.2.0 check

qemu-5.2.0-allow_custom_size_sd.patch

+diff -uNr qemu-5.2.0/hw/sd/sd.c qemu-5.2.0-allow_custom_size_sd/hw/sd/sd.c
+--- qemu-5.2.0/hw/sd/sd.c	2020-12-09 03:29:44.000000000 +1030
++++ qemu-5.2.0-allow_custom_size_sd/hw/sd/sd.c	2022-03-29 03:07:56.808634756 +1030
+@@ -32,7 +32,6 @@
+ 
+ #include "qemu/osdep.h"
+ #include "qemu/units.h"
+-#include "qemu/cutils.h"
+ #include "hw/irq.h"
+ #include "hw/registerfields.h"
+ #include "sysemu/block-backend.h"
+@@ -2153,35 +2152,11 @@
+     }
+ 
+     if (sd->blk) {
+-        int64_t blk_size;
+-
+         if (blk_is_read_only(sd->blk)) {
+             error_setg(errp, "Cannot use read-only drive as SD card");
+             return;
+         }
+ 
+-        blk_size = blk_getlength(sd->blk);
+-        if (blk_size > 0 && !is_power_of_2(blk_size)) {
+-            int64_t blk_size_aligned = pow2ceil(blk_size);
+-            char *blk_size_str;
+-
+-            blk_size_str = size_to_str(blk_size);
+-            error_setg(errp, "Invalid SD card size: %s", blk_size_str);
+-            g_free(blk_size_str);
+-
+-            blk_size_str = size_to_str(blk_size_aligned);
+-            error_append_hint(errp,
+-                              "SD card size has to be a power of 2, e.g. %s.\n"
+-                              "You can resize disk images with"
+-                              " 'qemu-img resize <imagefile> <new-size>'\n"
+-                              "(note that this will lose data if you make the"
+-                              " image smaller than it currently is).\n",
+-                              blk_size_str);
+-            g_free(blk_size_str);
+-
+-            return;
+-        }
+-
+         ret = blk_set_perm(sd->blk, BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE,
+                            BLK_PERM_ALL, errp);
+         if (ret < 0) {