stellaris: fix min buffer length checks

Word count == size/4; cope.  And increase buf_min so it's large
enough to cover the overhead in my tests.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

diff --git a/src/flash/nor/stellaris.c b/src/flash/nor/stellaris.c
index 51fe677cd75a8c9acb1836c7cfa0a28b9b40eedd..f414ca6f1f0e1582ca821c2ab411b4090f1e66bb 100644 (file)
--- a/src/flash/nor/stellaris.c
+++ b/src/flash/nor/stellaris.c
@@ -826,10 +826,10 @@ static int stellaris_write_block(struct flash_bank *bank,
        int retval = ERROR_OK;
 
        /* power of two, and multiple of word size */
-       static const unsigned buf_min = 32;
+       static const unsigned buf_min = 128;
 
        /* for small buffers it's faster not to download an algorithm */
-       if (wcount < buf_min)
+       if (wcount * 4 < buf_min)
                return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 
        LOG_DEBUG("(bank=%p buffer=%p offset=%08" PRIx32 " wcount=%08" PRIx32 "",
@@ -843,11 +843,8 @@ static int stellaris_write_block(struct flash_bank *bank,
        };
 
        /* plus a buffer big enough for this data */
-       if (wcount < buffer_size) {
-               buffer_size = wcount;
-               buffer_size += buf_min - 1;
-               buffer_size &= ~(buf_min - 1);
-       }
+       if (wcount * 4 < buffer_size)
+               buffer_size = wcount * 4;
 
        /* memory buffer */
        while (target_alloc_working_area(target, buffer_size, &source) != ERROR_OK)