hw/sd/sdcard: Add eMMC 'boot-partition-size' property

Avoid hardcoding 1MiB boot size in EXT_CSD_BOOT_MULT,
expose it as 'boot-partition-size' QOM property.

By default, do not use any size. The board is responsible
to set the boot partition size property.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Cédric Le Goater <clg@redhat.com>
Message-Id: <20240712162719.88165-10-philmd@linaro.org>

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 2246213b3171cc9a972b377832021ed3275b50d0..d49b144214ac95e42e916b646dbf4441060481c8 100644 (file)
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -135,6 +135,7 @@ struct SDState {
     /* Static properties */
 
     uint8_t spec_version;
+    uint64_t boot_part_size;
     BlockBackend *blk;
 
     const SDProto *proto;
@@ -492,7 +493,8 @@ static void emmc_set_ext_csd(SDState *sd, uint64_t size)
     /* Properties segment (RO) */
     sd->ext_csd[EXT_CSD_S_CMD_SET] = 0b1; /* supported command sets */
     sd->ext_csd[EXT_CSD_BOOT_INFO] = 0x0; /* Boot information */
-    sd->ext_csd[EXT_CSD_BOOT_MULT] = 0x8; /* Boot partition size. 128KB unit */
+                                     /* Boot partition size. 128KB unit */
+    sd->ext_csd[EXT_CSD_BOOT_MULT] = sd->boot_part_size / (128 * KiB);
     sd->ext_csd[EXT_CSD_ACC_SIZE] = 0x1; /* Access size */
     sd->ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] = 0x01; /* HC Erase unit size */
     sd->ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT] = 0x01; /* HC erase timeout */
@@ -2704,6 +2706,7 @@ static Property sd_properties[] = {
 };
 
 static Property emmc_properties[] = {
+    DEFINE_PROP_UINT64("boot-partition-size", SDState, boot_part_size, 0),
     DEFINE_PROP_END_OF_LIST()
 };