From 4797b42e763f6a47f51618451a251916c00eae48 Mon Sep 17 00:00:00 2001
From: CTCaer <ctcaer@gmail.com>
Date: Wed, 17 Dec 2025 04:30:12 +0200
Subject: [PATCH] bdk: sdmmc: add defines for max block number

---
 bdk/storage/sdmmc.c        | 2 +-
 bdk/storage/sdmmc.h        | 2 ++
 bdk/storage/sdmmc_driver.c | 4 ++--
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/bdk/storage/sdmmc.c b/bdk/storage/sdmmc.c
index 0dd994f6..d5842155 100644
--- a/bdk/storage/sdmmc.c
+++ b/bdk/storage/sdmmc.c
@@ -327,7 +327,7 @@ static int _sdmmc_storage_readwrite(sdmmc_storage_t *storage, u32 sector, u32 nu
 		do
 		{
 reinit_try:
-			if (_sdmmc_storage_readwrite_ex(storage, &blkcnt, sct_off, MIN(sct_total, 0xFFFF), bbuf, is_write))
+			if (_sdmmc_storage_readwrite_ex(storage, &blkcnt, sct_off, MIN(sct_total, SDMMC_AMAX_BLOCKNUM), bbuf, is_write))
 				goto out;
 			else
 				retries--;
diff --git a/bdk/storage/sdmmc.h b/bdk/storage/sdmmc.h
index 6da130a0..e1b3fcda 100644
--- a/bdk/storage/sdmmc.h
+++ b/bdk/storage/sdmmc.h
@@ -24,6 +24,8 @@
 
 #define SDMMC_CMD_BLOCKSIZE 64
 #define SDMMC_DAT_BLOCKSIZE 512
+#define SDMMC_HMAX_BLOCKNUM 0xFFFF // HW max.
+#define SDMMC_AMAX_BLOCKNUM 0xF000 // Aligned max.
 
 extern u32 sd_power_cycle_time_start;
 
diff --git a/bdk/storage/sdmmc_driver.c b/bdk/storage/sdmmc_driver.c
index f46f67bb..c279ec86 100644
--- a/bdk/storage/sdmmc_driver.c
+++ b/bdk/storage/sdmmc_driver.c
@@ -1008,8 +1008,8 @@ static int _sdmmc_config_sdma(sdmmc_t *sdmmc, u32 *blkcnt_out, const sdmmc_req_t
 		return 0;
 
 	u32 blkcnt = req->num_sectors;
-	if (blkcnt >= 0xFFFF)
-		blkcnt = 0xFFFF;
+	if (blkcnt >= SDMMC_HMAX_BLOCKNUM)
+		blkcnt = SDMMC_HMAX_BLOCKNUM;
 	u32 admaaddr = (u32)req->buf;
 
 	// Check alignment.